Manually backup iOS Photo gallery

Heres my problem: I have the automatic camera Uploads on and it did a good job of backing up all my files on my iphone. However, I have been doing some housekeeping and got rid off a lot of my files in the photo app on my Iphone (for example blurry pictures and duplicata shots etc). Now I am looking for a way to upload my photo gallery in the current state into my dropbox replacing the old unsorted version. Is there any way to do this?

 

I have tried deleting a test picture in my camera uploads folder in dropbox after turning the automatic uploads off but after turning them back on the picture which is still on my phones library was not uploaded again even though my settings for the upload include all pictures and not just the ones taken after the automatic uploads were turned on. I even tried to put the pictures that were on my phone but not synced to the dropbox (because I moved them or deleted them from the camera uploads folder)  into a folder which I then selected for the camera Uploads to upload from but the feature didnt recognize them as photos it has to upload.

 

Thus my plan to turn off camera uploads and then just delete all the files in my dropbox camera uploads folder (which include all the bad pictures I have deleted on my phone) to then turn the camera uploads back on so that only the wanted pictures will be uploaded again doesnt seem to work.

 

Any help is appreciated and I hope I could explain my issue well enough, let me know if you need any more details as this is my first support request, thanks all ; )