Perf. calibration zip: "Upload failed: Error: Only mimetype application/zip supported"

Steps to Reproduce:
Go to Perf. calibration → Options
Upload your own in a zip file (.wav + audacity txt file)

Expected Results:
.zip file uploads successfully.

Actual Results:
I get error: Upload failed: Error: Only mimetype application/zip supported
Same with all projects, and with any .zip file I have tried.

Reproducibility:

  • [X] Always
  • [ ] Sometimes
  • [ ] Rarely