How to Storage mp4 video thumbnail show

[bestprintsf (Leandro Z)]

I think the permissions are wrong. Your permissions are to write and not to read.
Check this topic, i’m sure help you

READ_ / WRITE_EXTERNAL_STORAGE permissions / app-Specific (Private) External Storage

Hello especially to the developers, for several reasons I want to switch from App Inventor to Kodular. Unfortunately, Kokular also has a permission issue (READ_WRITE_EXTERNAL_STORAGE) when saving to an app-specific folder. I have already posted this issue in the App Inventor Forum, but have not received a satisfactory answer. I would like to save files in the so-called “app-specific (private) external storage”. According to Google, this does not require READ_ / WRITE_EXTERNAL STORAGE permissio…