This is a bit of a wild guess, but I have the main project that I am working on, and it always uploads 2-3 mb when I am opening live edit, but I recently was testing a bug so I opened another island and its live edit, then came back and the project now uploaded everything again, then gave an upload error
uefn-attachments-2023.05.08-00.49.06.zip (5.6 MB)
EDIT: This was a one-time thing.