Sync folders across devices
Main reason why I am still using OneDrive is that I need to keep folders on 2 PCs synced and local (on both PCs). Proton does not seem to allow this. Or at least it seems to allow this only for files that were initially uploaded to cloud, but not for folders that were added on one of the PCs.
The idea is that I sync folders on PC1 to Proton, then on PC2 I "link" that folder on PC1 to respective location on PC2 (ideally with option to link each individual folder from PC1 to individual folder on PC2, but even linking whole set of uploaded files like OneDrive is fine). Then I modify a file on PC1 or PC2 and updated version gets uploaded both to the cloud and to PC2 or PC1 respectively.
Not only will this replicate what makes OneDrive good (at least for my usecase), but it will allow to save space in Proton, since you will not be uploading the same data twice (separate copies from PC1 and PC2). This will also reduce network traffic, at least in situations, when you need to resync data after significant crash or Window reinstall or whatever else, that will make Proton think you are on a different PC, while your files are still there.
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Pat C commented
This! Number one reason why I can't make the switch. I use SugarSync which does this very well.