This never used to be a problem.
In Garmin Connect Mobile, when I attempt to attach images to an activity, some of them show up in the available images to attach, others don't.
Typically, it's photos taken with the smartphone's camera that DO show up.
Downloaded images and screenshots do NOT show up.
I have tried:
* uninstalling app, reinstalling
* "allowing" all permissions in the app and in Android's app permission settings
*checked for any kind of blocking app (eg: disabled Blokada)
* moved images to a different folder on the device (example: moved to the camera's default storage folder, to the downloads folder, to a DCIM folder)