Source
You can add and modify your galleries from the Source tab. It also allows you to add and remove additional galleries.
You can choose the source as either static and dynamic (to include ACF fields).
Static
When the source is static, the content does not change or adapt in any way for any user.
Name
Allows you to name your galleries in order to manage them.
Edit 
Allows you to Edit a gallery where you can add images from your computer or Media Library or drag and drop to reorder them.
Add 
Allows you to create additional galleries.
Remove 
Allows you to remove galleries you have added.
Dynamic
The gallery
block currently supports the ACF Gallery field for dynamic galleries.
Remember to refresh before and after adding images to your ACF Gallery.
ACF
In order to set your dynamic source to ACF, select ACF in the Data panel.
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