I have digikam 7.1.0 installed via appimage.
I have GIMP installed from Linux Mint repositories.
I cannot find a way of opening the image in GIMP. The Open With command has zero applications show up in the dialog. The only apps I can load the image into are those that are installed via appimage because I can find and navigate to that folder. However since GIMP is repository based I just can’t figure out how to open it from digikam. Open in Folder also doesn’t work as a workaround because the file itself doesn’t get highlighted only the folder gets opened).