This is very similar to the issue here: https://www.drupal.org/node/2771865 →
Problem/Motivation
Currently the site-builder can upload a custom icon when creating an embed button, or rely on the default button provided by the button plugins.
We had a need to set custom icons for our embed buttons, but every time you config-export that uploaded file UUID, it would be irrelevant to other environments. Manually uploading an icon on each environment is not viable as subsequent config-imports would undo the association.
Proposed resolution
Add a new form element on the button creation, allowing the user to enter a non-managed file path (eg. into the theme, or modules directory).
Closed: won't fix
1.0
Code
The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.
The patch in #41 preserves the functionality itself and replaces the deprecated `file_create_url` function but it does not contain some of the code form the previous patch #39: there are no form element to set the icon file location.
Re-rolled the patch in #39for compatibility with Drupal 10 (CKEditor 4)
Hello folks.
Here is a new version of patch #42, that you can apply of new release 1.7