Please check if in the prerelease version of Publii this issue occurs too. I see that indeed the problem with uploading images occurs sometimes on v.0.35.3 but I am unable to reproduce it on the prerelease version: https://forum.getpublii.com/topic/publii-0-36-prerelease-3-come-help-us-make-it-better/ it has never Electron and sharp, what could solve this issue.