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Hi my name is ***** ***** I will be the expert working with you today to help and resolve the problem you have posted.
Which photo gallery are you using?
Backup your photos on the sd card or on and external drive and then remove the photo gallery app from the apps installed.
remove the app and after removal restart your phone and then open google play and download the photo gallery app that will bring back the delete button option.
What is not working can you be a bit specific?
that must be the remote support assistance it does not apply for your question so you can simply close it. Its an additional option for our computer category customers.
apart from billing issue otherwise i have provided you the correct resolution to fix the problem you have posted.