diff --git a/apps/sim/app/api/function/execute/route.ts b/apps/sim/app/api/function/execute/route.ts
index e6698c328c..bd796105c6 100644
--- a/apps/sim/app/api/function/execute/route.ts
+++ b/apps/sim/app/api/function/execute/route.ts
@@ -593,6 +593,7 @@ async function maybeExportSandboxFileToWorkspace(args: {
   workspaceId?: string
   outputPath?: string
   outputFormat?: string
+  outputMimeType?: string
   outputSandboxPath?: string
   exportedFileContent?: string
   stdout: string
@@ -604,6 +605,7 @@ async function maybeExportSandboxFileToWorkspace(args: {
     workspaceId,
     outputPath,
     outputFormat,
+    outputMimeType,
     outputSandboxPath,
     exportedFileContent,
     stdout,
@@ -650,14 +652,23 @@ async function maybeExportSandboxFileToWorkspace(args: {
   }
 
   const fileName = normalizeOutputWorkspaceFileName(outputPath)
-  const format = resolveOutputFormat(fileName, outputFormat)
-  const contentType = FORMAT_TO_CONTENT_TYPE[format]
+
+  const TEXT_MIMES = new Set(Object.values(FORMAT_TO_CONTENT_TYPE))
+  const resolvedMimeType =
+    outputMimeType ||
+    FORMAT_TO_CONTENT_TYPE[resolveOutputFormat(fileName, outputFormat)] ||
+    'application/octet-stream'
+  const isBinary = !TEXT_MIMES.has(resolvedMimeType)
+  const fileBuffer = isBinary
+    ? Buffer.from(exportedFileContent, 'base64')
+    : Buffer.from(exportedFileContent, 'utf-8')
+
   const uploaded = await uploadWorkspaceFile(
     resolvedWorkspaceId,
     authUserId,
-    Buffer.from(exportedFileContent, 'utf-8'),
+    fileBuffer,
     fileName,
-    contentType
+    resolvedMimeType
   )
 
   return NextResponse.json({
@@ -702,6 +713,7 @@ export async function POST(req: NextRequest) {
       language = DEFAULT_CODE_LANGUAGE,
       outputPath,
       outputFormat,
+      outputMimeType,
       outputSandboxPath,
       envVars = {},
       blockData = {},
@@ -815,6 +827,7 @@ export async function POST(req: NextRequest) {
           workspaceId,
           outputPath,
           outputFormat,
+          outputMimeType,
           outputSandboxPath,
           exportedFileContent,
           stdout: shellStdout,
@@ -938,6 +951,7 @@ export async function POST(req: NextRequest) {
             workspaceId,
             outputPath,
             outputFormat,
+            outputMimeType,
             outputSandboxPath,
             exportedFileContent,
             stdout,
@@ -1019,6 +1033,7 @@ export async function POST(req: NextRequest) {
           workspaceId,
           outputPath,
           outputFormat,
+          outputMimeType,
           outputSandboxPath,
           exportedFileContent,
           stdout,
diff --git a/apps/sim/app/workspace/[workspaceId]/files/components/file-viewer/file-viewer.tsx b/apps/sim/app/workspace/[workspaceId]/files/components/file-viewer/file-viewer.tsx
index fcca3eab13..6a90ebacbb 100644
--- a/apps/sim/app/workspace/[workspaceId]/files/components/file-viewer/file-viewer.tsx
+++ b/apps/sim/app/workspace/[workspaceId]/files/components/file-viewer/file-viewer.tsx
@@ -163,7 +163,7 @@ export function FileViewer({
   }
 
   if (category === 'iframe-previewable') {
-    return <IframePreview file={file} />
+    return <IframePreview file={file} workspaceId={workspaceId} />
   }
 
   if (category === 'image-previewable') {
@@ -454,13 +454,36 @@ function TextEditor({
   )
 }
 
-const IframePreview = memo(function IframePreview({ file }: { file: WorkspaceFileRecord }) {
-  const serveUrl = `/api/files/serve/${encodeURIComponent(file.key)}?context=workspace`
+const IframePreview = memo(function IframePreview({
+  file,
+  workspaceId,
+}: {
+  file: WorkspaceFileRecord
+  workspaceId: string
+}) {
+  const { data: fileData, isLoading } = useWorkspaceFileBinary(workspaceId, file.id, file.key)
+  const [blobUrl, setBlobUrl] = useState<string | null>(null)
+
+  useEffect(() => {
+    if (!fileData) return
+    const blob = new Blob([fileData], { type: 'application/pdf' })
+    const url = URL.createObjectURL(blob)
+    setBlobUrl(url)
+    return () => URL.revokeObjectURL(url)
+  }, [fileData])
+
+  if (isLoading || !blobUrl) {
+    return (
+      <div className='flex h-full items-center justify-center'>
+        <Skeleton className='h-[200px] w-[80%]' />
+      </div>
+    )
+  }
 
   return (
     <div className='flex flex-1 overflow-hidden'>
       <iframe
-        src={serveUrl}
+        src={blobUrl}
         className='h-full w-full border-0'
         title={file.name}
         onError={() => {
diff --git a/apps/sim/lib/copilot/tools/handlers/function-execute.ts b/apps/sim/lib/copilot/tools/handlers/function-execute.ts
index 36ec20ee95..61cf5ed621 100644
--- a/apps/sim/lib/copilot/tools/handlers/function-execute.ts
+++ b/apps/sim/lib/copilot/tools/handlers/function-execute.ts
@@ -1,6 +1,109 @@
+import { createLogger } from '@sim/logger'
+import { getTableById, queryRows } from '@/lib/table/service'
+import {
+  downloadWorkspaceFile,
+  findWorkspaceFileRecord,
+  getSandboxWorkspaceFilePath,
+  listWorkspaceFiles,
+} from '@/lib/uploads/contexts/workspace/workspace-file-manager'
 import { executeTool as executeAppTool } from '@/tools'
 import type { ToolExecutionContext, ToolExecutionResult } from '../../tool-executor/types'
 
+const logger = createLogger('CopilotFunctionExecute')
+
+const MAX_FILE_SIZE = 10 * 1024 * 1024
+const MAX_TOTAL_SIZE = 50 * 1024 * 1024
+
+interface SandboxFile {
+  path: string
+  content: string
+}
+
+async function resolveInputFiles(
+  workspaceId: string,
+  inputFiles?: unknown[],
+  inputTables?: unknown[]
+): Promise<SandboxFile[]> {
+  const sandboxFiles: SandboxFile[] = []
+  let totalSize = 0
+
+  if (inputFiles?.length && workspaceId) {
+    const allFiles = await listWorkspaceFiles(workspaceId)
+    for (const fileRef of inputFiles) {
+      if (typeof fileRef !== 'string') continue
+      const record = findWorkspaceFileRecord(allFiles, fileRef)
+      if (!record) {
+        logger.warn('Input file not found', { fileRef })
+        continue
+      }
+      if (record.size > MAX_FILE_SIZE) {
+        logger.warn('Input file exceeds size limit', { fileId: record.id, size: record.size })
+        continue
+      }
+      if (totalSize + record.size > MAX_TOTAL_SIZE) {
+        logger.warn('Total input size limit reached')
+        break
+      }
+      const buffer = await downloadWorkspaceFile(record)
+      totalSize += buffer.length
+      const isText = /^text\/|application\/json|application\/xml|application\/csv/.test(
+        record.type || ''
+      )
+      const content = isText ? buffer.toString('utf-8') : buffer.toString('base64')
+      sandboxFiles.push({
+        path: getSandboxWorkspaceFilePath(record),
+        content,
+        encoding: isText ? undefined : 'base64',
+      } as SandboxFile)
+    }
+  }
+
+  if (inputTables?.length) {
+    for (const tableId of inputTables) {
+      if (typeof tableId !== 'string') continue
+      const table = await getTableById(tableId)
+      if (!table) {
+        logger.warn('Input table not found', { tableId })
+        continue
+      }
+      const rows = await queryRows(tableId, workspaceId, {}, 'copilot-fn-exec')
+      if (!rows.rows?.length) continue
+
+      const allKeys = new Set<string>()
+      for (const row of rows.rows) {
+        if (row.data && typeof row.data === 'object') {
+          for (const key of Object.keys(row.data as Record<string, unknown>)) {
+            allKeys.add(key)
+          }
+        }
+      }
+      const headers = Array.from(allKeys)
+      const csvLines = [headers.join(',')]
+      for (const row of rows.rows) {
+        const data = (row.data || {}) as Record<string, unknown>
+        csvLines.push(
+          headers
+            .map((h) => {
+              const val = data[h]
+              const str = val === null || val === undefined ? '' : String(val)
+              return str.includes(',') || str.includes('"') || str.includes('\n')
+                ? `"${str.replace(/"/g, '""')}"`
+                : str
+            })
+            .join(',')
+        )
+      }
+      const csvContent = csvLines.join('\n')
+      sandboxFiles.push({
+        path: `/home/user/tables/${tableId}.csv`,
+        content: csvContent,
+      })
+    }
+  }
+
+  return sandboxFiles
+}
+
 export async function executeFunctionExecute(
   params: Record<string, unknown>,
   context: ToolExecutionContext
@@ -14,6 +117,19 @@ export async function executeFunctionExecute(
     }
   }
 
+  if (context.workspaceId) {
+    const inputFiles = enrichedParams.inputFiles as unknown[] | undefined
+    const inputTables = enrichedParams.inputTables as unknown[] | undefined
+
+    if (inputFiles?.length || inputTables?.length) {
+      const resolved = await resolveInputFiles(context.workspaceId, inputFiles, inputTables)
+      if (resolved.length > 0) {
+        const existing = (enrichedParams._sandboxFiles as SandboxFile[]) || []
+        enrichedParams._sandboxFiles = [...existing, ...resolved]
+      }
+    }
+  }
+
   enrichedParams._context = {
     ...(typeof enrichedParams._context === 'object' && enrichedParams._context !== null
       ? (enrichedParams._context as object)
diff --git a/apps/sim/lib/execution/doc-worker.cjs b/apps/sim/lib/execution/doc-worker.cjs
index 60f97b875f..bf720ab320 100644
--- a/apps/sim/lib/execution/doc-worker.cjs
+++ b/apps/sim/lib/execution/doc-worker.cjs
@@ -39,7 +39,16 @@ const FORMATS = {
     async setup() {
       const PDFLib = require('pdf-lib')
       const pdf = await PDFLib.PDFDocument.create()
-      return { globals: { PDFLib, pdf }, pdf }
+
+      async function embedImage(dataUri) {
+        const base64 = dataUri.split(',')[1]
+        const bytes = Buffer.from(base64, 'base64')
+        const mime = dataUri.split(';')[0].split(':')[1] || ''
+        if (mime.includes('png')) return pdf.embedPng(bytes)
+        return pdf.embedJpg(bytes)
+      }
+
+      return { globals: { PDFLib, pdf, embedImage }, pdf }
     },
     async serialize(ctx) {
       const pdf = ctx.globals.pdf
diff --git a/apps/sim/lib/execution/e2b.ts b/apps/sim/lib/execution/e2b.ts
index cd5733d974..1338b35d28 100644
--- a/apps/sim/lib/execution/e2b.ts
+++ b/apps/sim/lib/execution/e2b.ts
@@ -6,6 +6,7 @@ import { CodeLanguage } from '@/lib/execution/languages'
 export interface SandboxFile {
   path: string
   content: string
+  encoding?: 'base64'
 }
 
 export interface E2BExecutionRequest {
@@ -49,7 +50,15 @@ export async function executeInE2B(req: E2BExecutionRequest): Promise<E2BExecuti
 
   if (req.sandboxFiles?.length) {
     for (const file of req.sandboxFiles) {
-      await sandbox.files.write(file.path, file.content)
+      if (file.encoding === 'base64') {
+        const buf = Buffer.from(file.content, 'base64')
+        await sandbox.files.write(
+          file.path,
+          buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.byteLength)
+        )
+      } else {
+        await sandbox.files.write(file.path, file.content)
+      }
     }
     logger.info('Wrote sandbox input files', {
       sandboxId,
@@ -125,9 +134,30 @@ export async function executeInE2B(req: E2BExecutionRequest): Promise<E2BExecuti
       }
     }
 
-    const exportedFileContent = outputSandboxPath
-      ? await sandbox.files.read(outputSandboxPath)
-      : undefined
+    let exportedFileContent: string | undefined
+    if (outputSandboxPath) {
+      const ext = outputSandboxPath.slice(outputSandboxPath.lastIndexOf('.')).toLowerCase()
+      const binaryExts = new Set([
+        '.png',
+        '.jpg',
+        '.jpeg',
+        '.gif',
+        '.webp',
+        '.pdf',
+        '.zip',
+        '.mp3',
+        '.mp4',
+        '.docx',
+        '.pptx',
+        '.xlsx',
+      ])
+      if (binaryExts.has(ext)) {
+        const b64Result = await sandbox.commands.run(`base64 -w0 "${outputSandboxPath}"`)
+        exportedFileContent = b64Result.stdout
+      } else {
+        exportedFileContent = await sandbox.files.read(outputSandboxPath)
+      }
+    }
 
     return {
       result,
@@ -164,7 +194,15 @@ export async function executeShellInE2B(
 
   if (req.sandboxFiles?.length) {
     for (const file of req.sandboxFiles) {
-      await sandbox.files.write(file.path, file.content)
+      if (file.encoding === 'base64') {
+        const buf = Buffer.from(file.content, 'base64')
+        await sandbox.files.write(
+          file.path,
+          buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.byteLength)
+        )
+      } else {
+        await sandbox.files.write(file.path, file.content)
+      }
     }
     logger.info('Wrote sandbox input files', {
       sandboxId,
@@ -237,9 +275,32 @@ export async function executeShellInE2B(
       cleanedStdout = filteredLines.join('\n')
     }
 
-    const exportedFileContent = outputSandboxPath
-      ? await sandbox.files.read(outputSandboxPath)
-      : undefined
+    let exportedFileContent: string | undefined
+    if (outputSandboxPath) {
+      const ext = outputSandboxPath.slice(outputSandboxPath.lastIndexOf('.')).toLowerCase()
+      const binaryExts = new Set([
+        '.png',
+        '.jpg',
+        '.jpeg',
+        '.gif',
+        '.webp',
+        '.pdf',
+        '.zip',
+        '.mp3',
+        '.mp4',
+        '.docx',
+        '.pptx',
+        '.xlsx',
+      ])
+      if (binaryExts.has(ext)) {
+        const b64Result = await sandbox.commands.run(`base64 -w0 "${outputSandboxPath}"`, {
+          user: 'root',
+        })
+        exportedFileContent = b64Result.stdout
+      } else {
+        exportedFileContent = await sandbox.files.read(outputSandboxPath)
+      }
+    }
 
     return { result: parsed, stdout: cleanedStdout, sandboxId, exportedFileContent }
   } finally {
diff --git a/apps/sim/tools/function/execute.ts b/apps/sim/tools/function/execute.ts
index 7c8841e11c..844b1c6d51 100644
--- a/apps/sim/tools/function/execute.ts
+++ b/apps/sim/tools/function/execute.ts
@@ -35,30 +35,37 @@ export const functionExecuteTool: ToolConfig<CodeExecutionInput, CodeExecutionOu
     outputPath: {
       type: 'string',
       required: false,
-      visibility: 'user-or-llm',
+      visibility: 'hidden',
       description:
         'Write the tool result back to a workspace file, e.g. "files/result.json" or "files/report.csv". Use for text/JSON/CSV/markdown/html outputs.',
     },
     outputFormat: {
       type: 'string',
       required: false,
-      visibility: 'user-or-llm',
+      visibility: 'hidden',
       description: 'Optional format override for outputPath (json, csv, txt, md, html).',
     },
     outputTable: {
       type: 'string',
       required: false,
-      visibility: 'user-or-llm',
+      visibility: 'hidden',
       description:
         'Overwrite a workspace table with the code result. The code must return an array of objects.',
     },
     outputSandboxPath: {
       type: 'string',
       required: false,
-      visibility: 'user-or-llm',
+      visibility: 'hidden',
       description:
         'Export a file created inside the sandbox to the workspace. Provide the sandbox file path here and also set outputPath to the workspace destination.',
     },
+    outputMimeType: {
+      type: 'string',
+      required: false,
+      visibility: 'hidden',
+      description:
+        'MIME type for the exported file. Required for binary files (e.g. "image/png", "application/pdf"). If omitted, inferred from outputPath extension for text formats.',
+    },
     envVars: {
       type: 'object',
       required: false,
@@ -115,6 +122,7 @@ export const functionExecuteTool: ToolConfig<CodeExecutionInput, CodeExecutionOu
         outputFormat: params.outputFormat,
         outputTable: params.outputTable,
         outputSandboxPath: params.outputSandboxPath,
+        outputMimeType: params.outputMimeType,
         envVars: params.envVars || {},
         workflowVariables: params.workflowVariables || {},
         blockData: params.blockData || {},
diff --git a/apps/sim/tools/function/types.ts b/apps/sim/tools/function/types.ts
index 09d86961ef..9fb66875a3 100644
--- a/apps/sim/tools/function/types.ts
+++ b/apps/sim/tools/function/types.ts
@@ -11,6 +11,7 @@ export interface CodeExecutionInput {
   outputFormat?: 'json' | 'csv' | 'txt' | 'md' | 'html'
   outputTable?: string
   outputSandboxPath?: string
+  outputMimeType?: string
   envVars?: Record<string, string>
   workflowVariables?: Record<string, unknown>
   blockData?: Record<string, unknown>