I left the office and let the PC on to upload a folder with many files. Came 4 hours later to find out it hadn't uploaded any files at all due to the "It might affect your PC's performance; are you sure?" prompt. Every single time you have to confirm. If I had the "always allow" option, it wouldn't have happened.

When uploading a large folder, it takes Proton Drive a while to process or show anything. And only then does the "are you sure you want to upload many files" comes.