The texture can not be edited directly.
The texture itself is saved into the .lib4d file and is only accessed through that file.
If you copy the path “preset://presets.lib4d/tex/image_file.tif” and try to navigate to it in finder / explorer you will never find it.
If you want to make edits you are much better off making a copy of your base texture and saving each edit as an increment or uniquely named file and then connecting the new texture manually.
If you are using relative texture paths this can be as easy as adding an increment to the file name. ie. “text” -> “text_01”