Edit file metadata (including photos)
Don't need much. Currently, the Photos portion of Drive doesn't have any capability beyond view photo.
I would like to be able to upload lots of photos and re-arrange them/fix metadata issues.
Primarily, Windows has taken some of my old photos I've edited/restored and made the Date Modified to today's date, when the photo date taken was 1965. But when I upload to Photos, it appears as today's date.
I should be able to easily go in and correct these mistakes.

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Roger commented
I do not think that proton drive is the place to manage the metadata of files. The way the dates get interpreted used and presented to the user are more important to me. proton drive should use the modified dates correctly!
I am under the impression that proton drive has a problem with handling dates. The column "last modified" always shows the same date e.g. the upload date. This is totally useless.
See:
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Kayleigh L commented
The other metadata I would like to see is the ability to add a searchable description or caption to a photo. This would at least give the ability to manually tag who or what is in a photo for ease of finding it later via a text-based search, rather than needing to rely on image recognition for photos.
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Kayleigh L commented
I would LOVE the ability to edit the metadata on photos and videos so that they display correctly in the time-bound photo view. I have a huge number of videos and photos where their edited date is not close to the date that the photos were taken, like with scans of old photos and the like. I can't load my photo archive into Proton without the ability to correct the date info.