I recently upgraded my Dropbox to have the capacity to store all the photos that have been living on my iPhone. I connected to DropBox and have had 2 issues:
1) Though my phone (which I got in 2017) has photos going all the way back to 2010, it only uploads photos going back to 2017. I think (but am not yet certain) that it's only syncing the photos that were taken on this phone.
2) Every time I plug in the phone it uploads more photos - but all from the same 2017-2019 period. Each time I leave the phone plugged in until it quits uploading. So I'm not sure if the photos are i) re-uploading, ii) uploading in a different format (JPG vs. HEIC), iii) not uploading (i.e., the messages are false - which I think is unlikely), or iv) that some photos have been missed in the past upload.
Let me know if you have any guidance... I tooled around the past questions but my Dropbox app (which I just downloaded onto my phone) is different than the one described in some of the older responses.
Thanks in advance,
/A