Hi Nicolas,
Sorry for the late answer. I have recorded my screen so you know this issue :
Thank you for the great plugin !

Just to clarify for any new potential users:

The way to use this for adding comments/corrections to students' answers on essay items within the quiz module, etc., is to copy/paste their answers into your own text box and annotate it there.

Just FYI: When I select a correction type with the dropdown on the button, it is only reflected in the correction window the first one or two assignments. After that, regardless of what I select, the dropdown in the entry window has reset to my top correction in the list.

Is there a development plan for tinymce?

Polaris,
No, there is no such plan.

We are now staging an upgrade to Moodle 3.6. It appears Atto Corrections will not work with that version, a major obstacle. Are there plans to upgrade the plugin to work with Moodle 3.6? Hope so.

Dear James,
Our initial testing shows that this plugin should work without any hiccups in Moodle 3.6. Could you please elaborate?

Dear Nicolas,
Thank you for replying. We applied successive updates to a 2.9 installation with atto-corrections installed. At the end, corrections, more_font_colors, and more_font_background_colors were disabled. I assumed due to incompatibility. However, re-installing the plugins has mostly corrected the problem. We have still found that the icons for corrections do not display in the atto toolbar. Still working on it.

Nicolas,
To follow through, the atto-corrections is now working properly with v3.6. However, as stated above, corrections did not survive the upgrade process, nor has the re-install been smooth. The icon images were not copied to the theme/image.php folder. We have a highly customized theme so this might be a write permissions problem on our end. It seems the permissions are correct but perhaps not. Anyway, thank you for your attention.

Hello. This seems to be a very useful plugin. May I ask if it is compatible with Moodle 3.10?

Hello. From our initial testing it should be fully compatible with Moodle 3.10.

Thank you. I have installed the plugin on Moodle 3.10.1+ (Build: 20210226) and can report that I have not faced any problems.

Could you please let me know how I can modify the appearance of the corrections using CSS?
CSS changes through ".atto_corrections" work but not ".atto_corrections_comment".

P H, thanks for your feedback. As for styling the comments, any change to the .atto_corrections_comment rule set in the plugin's style.css should work. You might have to clear your moodle's caches after any change, though.

For your information, I retried and it worked. Thanks!