Keyboard accessibility: not working with CKEditor 5 inserting image

This issue is a little difficult to understand as written.

Sorry about the content editing problems. Made a mistake earlier on. I've tidied it up.

Is this issue about the inability to navigate by keyboard into the field I've indicated below?

Video demonstration of the problem added → .

to #15

it doesn't look like it's native CKEditor5/Drupal implementation of CKEditor5:
- which version of CKEditor5 do you have installed?
- do you have a custom plugin enabled?

here's a screenshot of CKEditor5 native feature:

I have not been able to replicate the interface shared by @jannakha. I can say that part of the difference is the IMCE file browser module. If I disable that, and check the "Enable image uploads" button in the text format configuration, I will see the icon shared by jannakha, the one with the up arrow. But if I click on that, it immediately opens my Windows Explorers for an upload, with no in-between options shown here to distinguish between "upload from computer", "insert with file manager", or "insert image via URL."

If, with IMCE disabled, I uncheck the "Enable image uploads," I get the icon with the link on it instead, and clicking on it gives the prompt to enter a URL, like @mweiler's initial report but without the IMCE file browser button beside the link box.

That is consistent with the wording of the "Enable image uploads" option, which says "When enabled, images can only be uploaded. When disabled, images can only be added by URL." It can do "only" one or the other, not both, without IMCE.

Drupal core with CKEditor5 10.2.4, the latest stable as of this writing. Maybe the @jannakha version is Drupal 11 and this has been improved to allow both without needing IMCE? I have not yet started our Drupal 11 update tests so don't have an environment ready to try that.

So, conclusion 1 is that the problem @mweiler is reporting is probably coming from IMCE, not CKE5 in core. Conclusion 2 is that we can't have both mechanisms for adding images without IMCE, so then the question becomes whether we want one button with an inaccessible-by-keyboard file upload, or two buttons that are maybe more confusing to differentiate at a glance.