[Closed] changing the wpml_cf_preferences of some ACF Fields after adding content / Custom blocks

Background of the issue:
I’ve created some custom blocks and option pages using ACF Pro. I’ve configured several fields as 'Copy' and populated them across ACF blocks and pages. Now, I’d like to change some of these fields to 'Copy Once' or 'Translate.'

Symptoms:
No specific issue or error message mentioned.

Questions:
If I update the field synchronization settings wpml_cf_preferences, will it affect existing content or break anything already published?
What’s the recommended setup for handling images in ACF blocks when using translation—should they be set to 'Translate' or 'Copy Once'?
What’s the best practice for Advanced Link fields in a multilingual setup—should they be copied once, translated, or handled differently?
I have created a custom Youtube Embed block with extra features using the URL field. I want to show a separate video (url) for each language. In that case, should I set it to translate or copy once?