Hello,
my website still in localhost.
Fresh WordPress install with just
-acf fields pro,
-elementor pro
-and your plugin
For the first problem it’s solved it was a question of privileges.
the real problem is acf gallery field!
(I’m using the elementor gallery widget associated to acf gallery)
using the forms in admin mode = everything is Okey. Perfect ??
But for frontend
no way to use a basic uploader!
Users (except admins) are not supposed to open/access to wp media. Plus it’s not friendly interface for them.
According to this discussion
https://support.advancedcustomfields.com/forums/topic/enable-basic-uploader-for-frontend-comments/
it is not possible .. But it dates from 2016 and we are in 2019… Maybe a solution exists (snippet code or a php tweak code?)