I can’t see internal storage. I saw in a video that by going to the library you have an icon “internal” this is missing i tried on 2 raspberry’s 4, same thing shows up. I didn’t transferred data so far is this mandatory to do first? i can see the folder “intenal” when checking the network folders of the volumio. I’m using currant version of volumio but the previous was behaving the same way.
Internal storage is for like a second intern harddisk you can than mount de harddisk to /mnt/internal
You can store music in /mnt/INTERNAL
This is whatever is available as free space on your SD card.
This music will automatically be added to your Volumio library when you click Update in the My Music section of Sources.
If you have a second Volumio system, it’s possible to add this as a network drive.
Hi All!
What is the maximum SD card size for /mnt /INTERNAL?
What is the maximum SD card size for /mnt /INTERNAL
not recommended because of corruption use a usb stick instead 
and size doesn’t matter 
…but what you want to put on it does.