File Upload Functionality Broken or Failing in Base44
The file upload functionality in your Base44 app is not working correctly. Users attempt to upload files (documents, images, PDFs) but the upload fails silently, hangs indefinitely, or shows an error. In some cases, the upload appears to succeed but the file is not accessible when trying to view or download it later.
File upload is essential for many business apps: document management systems, application forms with attachments, profile picture uploads, and product image management. When it breaks, a key part of your app's functionality is lost.
The issue may be file-type specific (PDFs upload fine but Word documents fail) or size-specific (small files work but anything over a few MB fails).
Error Messages You Might See
Common Causes
- File size exceeds the maximum upload limit configured in the app or hosting environment
- The file type is not in the list of allowed/accepted file formats
- The storage configuration (e.g., cloud storage bucket) is not properly connected or has incorrect permissions
- The upload component's progress handling has a bug that makes it appear to hang
- CORS settings on the storage service block uploads from the published app's domain
How to Fix It
Check if there's a file size limit configured in your upload component or app settings. Try uploading a very small file (under 100KB) of a common format (JPG, PDF) to test basic functionality.
Verify that the file storage service is properly configured and accessible. If using external storage, check the access credentials and permissions.
For apps that need to handle diverse file types and large uploads reliably, a developer can implement chunked uploads, proper progress tracking, and storage service configuration with appropriate security settings.
Real developers can help you.
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Senior PHP/Symfony developer and DevOps engineer with 20+ years of professional experience, running opcode.pl (web development agency, est. 2004).
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Solo dev shipping production apps with AI-assisted development. I specialize in rescuing broken Lovable/Bolt/Cursor builds and taking them to production. 10+ apps shipped including SaaS CRMs, gaming platforms, real estate tools, and Discord bots. Stack: Next.js 16, TypeScript, Tailwind CSS, FastAPI, PostgreSQL, Prisma. I use Claude Code with 50+ custom skills for rapid delivery. Average turnaround: 2-4 weeks from broken prototype to production.
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I’m a product-focused engineer and tech leader who builds scalable systems and turns ideas into production-ready platforms.
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Simon A.
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BurnHavoc
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Yovel Cohen
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You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
Why can't I upload files in my Base44 app?
Check the file size limit and allowed file types in your upload component settings. Try a small common file type (like a JPG under 100KB) to test basic functionality.
How do I increase the file size limit in Base44?
Look for upload size settings in your component or app configuration. Note that the hosting environment may also have its own upload limits that need to be adjusted.