Hi support,
Just a bug that I have noticed. I tried this on 2 sites to both which resulted in the same problem. Not on Helix framework though but on normal templates.
I upgraded a site from SPPB v3 to V5, then downgraded back to V3. Then I went to media and tried to upload an image, the image did not upload. The loader just spins and spins..... possible bug.
Cheers