Launch browser to photo.stovallhut.online/
Download Synology Photos from the app store.
Once logged in you can follow prompts to upload photos and/or setup incremental backup (from now moving forward but not loading what's on the device now).
By default if you have Live Photos saved on your camera they will be uploaded as such. I don't like that and have left it on accidentally lots of times.
Also, live or not the photo may not be stored in a standard .jpg format. The files have a .HEIC extension and might require special viewers (synology will view it but a user that can download the image may not be able to).
To address this BEFORE you take the pictures, on the phone go to settings->camera->formats and turn on Most Compatible.
To convert them AFTER the pictures are taken this is a great free utility...
(to convert photos in Synology Photos app, download them to Windows, convert them, delete and replace in Synology Photos)
https://www.copytrans.net/copytransheic/
https://www.howtogeek.com/345504/how-to-open-heic-files-on-windows-or-convert-them-to-jpeg/
May not want to change the photos that are stored on your phone of course but I did find this link about doing it...
https://www.howtogeek.com/666363/how-to-convert-heic-photos-to-jpg-on-iphone-and-ipad/