The developers decide whether an application has the ability to be moved to the SD card, However, you can not make it your default. We understand your frustration but we would advised reaching out to the applications developers directly as this is an option they control. If the application can be moved, You would find the application in Settings > Application you want to adjust > Move to SD Card option.
go to samsung folder - my files
you will see recent files, then categories, then "phone"
Beneath phone is "internal storage" and "SD card"
Select internal storage and scroll down to the folder called pctures or photos or whatever it might be called.... you might also have a DCIM folder - there could be pictures in there too
long press it - a tick box appears next to it and three dots in the top right corner
Press the three dots and you have an option to "move"
I hope that helps - it took me a while to figure out that you have to go in this way - doing it from the pictures storage straight away only gives you "details"
It boggles my mind that something this trivial and presumably routine isn't implemented as basic functionality. And I'm still unable to move anything from internal storage to my SD; no, none of the solutions listed in this thread, as of now, work for my s9+ because none of the suggested options are present: 'Select Category > Move to... (no Move option, etc).
But I thought I'd mention that when I opened Camera for the first time after having inserted my card, my phone recognized that and prompted me to select the SD as default storage. Still didn't move my existing content though.
Arg. Now looking for third-party file management solutions...
Maybe that works for photos that in DCIM but what about under categories, in my 9+, I have Images, Videos, Audio, Documents, Downloads and APK ...
When I click on Images, I have other 'files' like Camera, SD Card, another camera file.. I see have pics in my Sd Card-that's fine. I'm trying to get the other pics sent to my SD CARD and it's not letting me do it.
I long press camera, I don't get a move to option, there's Details-Share and Delete. I hit share, but nothing comes up to send to my SD CARD. This used to be so much easier back in the day..