Videos are getting automatically uploaded as .mov and not HEVC on my iPhone app.

nuttygamer, As zacv noted container formats are independent of encoding formats, despite designed and usually used in some optional relations - you erroneous assume some mandatory relationship that don't exist! In particular HEVC encoding may be packed in any container format (including .mov). 😉 Did you check what encoding is in your .mov file? Post the result...

PS: It's another story that instead of simple sync (what most probably you expect), Dropbox encodes the media (both photos and videos) on its own that may leads to some confusions sometimes. Just keep in mind, Dropbox don't sync them - they are always encoded and packed independently; maybe not in the way you expect. Container format doesn't mandate particular encoding format though! (.mov denotes container format, HEVC is encoding format)