Is this a Windows installation ? Which version of Gimp (you find that in Gimp menu Help -> About) ?
Patterns are best in your user profile typically C:\Users\"yourname"\AppData\Roaming\GIMP\2.10\patterns
This is a hidden folder, if you can not find it see: https://support.microsoft.com/en-us/help...windows-10 Your file something.png or something.jpg goes there. You can also open the image and Export As something.pat There is a small advantage there in that you can assign a name to it png/jpg will use the file name. Can get lost in all the other patterns.
The second option, the clipboard. There is a size limit on this, 1024 x 1024 pix. Anything larger is cropped. Easy to check, make a rectangular selection, Edit -> Copy Very first pattern in the pattern dock is the clipboard.
Patterns are best in your user profile typically C:\Users\"yourname"\AppData\Roaming\GIMP\2.10\patterns
This is a hidden folder, if you can not find it see: https://support.microsoft.com/en-us/help...windows-10 Your file something.png or something.jpg goes there. You can also open the image and Export As something.pat There is a small advantage there in that you can assign a name to it png/jpg will use the file name. Can get lost in all the other patterns.
The second option, the clipboard. There is a size limit on this, 1024 x 1024 pix. Anything larger is cropped. Easy to check, make a rectangular selection, Edit -> Copy Very first pattern in the pattern dock is the clipboard.