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.
Jen Jacobsen
I’m a Full-Stack Developer with over 10 years of experience building modern web and mobile applications. I enjoy working across the full product lifecycle — turning ideas into real, well-built products that are intuitive for users and scalable for businesses.
I particularly enjoy building mobile apps, modern web platforms, and solving complex technical problems in a way that keeps systems clean, reliable, and easy to maintain.
Matthew Butler
Systems Development Engineer @ Amazon Web Services
Dor Yaloz
SW engineer with 6+ years of experience,
I worked with React/Node/Python
did projects with React+Capacitor.js for ios
Supabase expert
rayush33
JavaScript (React.js, React Native, Node.js) Developer with demonstrated industry experience of 4+ years, actively looking for opportunities to hone my skills as well as help small-scale business owners with solutions to technical problems
Luca Liberati
I work on monoliths and microservices, backends and frontends, manage K8s clusters and love to design apps architecture
MFox
Full-stack professional senior engineer (15+years). Extensive experience in software development, qa, and IP networking.
Simon A.
I'm a backend developer building APIs, emulators, and interactive game systems. Professionally, I've developed Java/Spring reporting solutions, managed relational and NoSQL databases, and implemented CI/CD workflows.
Daniel Vázquez
Software Engineer with over 10 years of experience on Startups, Government, big tech industry & consulting.
Pratik
SWE with 15+ years of experience building and maintaining web apps and extensive BE infrastructure
Jaime Orts-Caroff
I'm a Senior Android developer, currently working at Aircall. I'm open to work in various fields!
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.