1 byte files when uploading many photos through Dropbox iOS app

Hi @walter, thanks for the response! I've reproduced the issue and attached all screenshots. 

I'm using the + button, manually selecting all photos (just keeping my finger on the screen and dragging it down to select hundreds). Usually, about 300-400 upload completely fine, but then the rest will start uploading (really fast aswell) as 1byte files. This happens both on my wives iPhone 12 Pro and own iPhone 13 Pro, by the way. Our apps are fully up to date, and this has happened for many years already. We've always had issues uploading alot of photos at once using the iOS app. 

Hereby some screenshots and what I did to reproduce the issue. My app is in Dutch, but you'll get the idea. 

Step 1: Remove the automatic lockscreen on my iPhone, so the screen won't go dark to keep the app alive. 

Step 2: Selected 1147 photos, press upload in the iOS app. No issues here, it just takes some time preparing the upload. There are also videos in this selection. 

Screenshot:

Step 3: The uploading of the photos has now started. No issues here. I put the phone down. 

Screenshot:

Step 4: Suddenly, without doing anything, after successfully uploading ~800/1147 photos, the upload will continue but will upload the photos as blank 135 byte files. In the past, it has many times also already happened after it has uploaded ~400 photos. It seems to be a little random. 

Screenshot from app:

Screenshot from desktop: 

from what I can see looking at the file names, it seems to be some kind of retry mechanism because it goes up to "(16)". What is also strange is that the faulty files have a file name containing the date and time of the upload, instead of the date and time the photo was taken. 

The event page just tells me that the file has been uploaded, nothing else. When I try to open the file, it shows me this:

I've double checked if there is anything "weird" happening during or after the photos taken at 15/12/2022 15:12 (the date&time after which it starts failing) and I can't seem to find any issues. They are normal photo's. 

Hope this displays the issue that I'm having clearly. Hope to hear from you 🙂