Media (Photos) on my device isn't scanning

Everything has been fine with Google Photos for me until recently other folders containing photos from apps like VSCO Cam other apps has disappeared from the "Device Folders" section of the app. As I said, these were all displayed until the last few days. I have no idea what happened. I use Solid Explorer and I can see the photos are all still on my phone so it's not like they've been deleted. Anyone come across this issue or would know how I can fix it? I've tried clearing the data/cache of the Photos app and that didn't work. I also tried clearing the cache of Media Storage but that didn't correct the problem either. I'm not sure what to do.

Anyone else had a similar issue or know how to resolve it?