We have flexible content on our site and when you set the flexible content to 'copy' but an image field inside a flexible content to 'translate' there are no edit buttons on the image when you translate a page.
On the other hand when you set the flexible content field to 'translate' and the image inside a flexible content field to 'translate' there are edit/delete buttons on the image, but then the flexible content isn't copied when you translate a page. You have to manually copy it, which is fine for the first time, but after translating independantly it doesn't copy the other flexible content's when you add one more in the original language.
Shouldn't it be possible to edit the image when the flexible content field is set to copy? for the editor and text fields inside the flexible content it's no problem. They are translatable when set to 'translate', but the image field is not translatable when set to 'translate'
In the case of the Flexible fields, we always recommend setting the preference to "Copy-once". Could you please change the preference for the Flexible field and Image field to Copy-Once and check if that helps to solve the issue? With that option, the field value will be copied to the translated version for once and will no longer be synced after that. You can update field values manually from the WordPress Editor.
Please let me know if that helps or if you need further assistance in this matter. I will be happy to help.