If the Upload button appears greyed out or disabled after selecting a large file, the file may exceed the browser's upload handling capacity. Here's how to work around it.
Common Causes
The file is extremely large (typically 500MB+) and the browser struggles with the transfer
Your internet connection is too slow for the file size
The browser tab ran out of memory during file preparation
How to Fix It
Try a different browser — Chrome typically handles large uploads better than other browsers
Close other browser tabs to free up memory
Use the ACC integration instead of dragging the file — ACC uploads process server-side and avoid browser memory limits
Upload via the Revit plugin — open the model in Revit and use Upload → Sync to bypass the web upload entirely
Frequently Asked Questions
Q: Is there a maximum file size for uploads?
A: There is no hard limit enforced by Pirros, but very large files (500MB+) may encounter browser-level constraints. Use the ACC integration or Revit plugin for large models.
Q: Can I split a large model into smaller uploads?
A: You can use Upload Settings to limit which view types are extracted (e.g., sheeted details only, no schedules or legends), which reduces processing time but doesn't reduce the file transfer size. For file size issues, use ACC or the plugin instead.