Upload: drop duplicate images and display warning in custom selector#6765

Akul-Tyagi wants to merge 3 commits intocommons-app:maincommons-app/apps-android-commons:mainfrom

Akul-Tyagi:fix/custom-selector-duplicate-warningAkul-Tyagi/apps-android-commons:fix/custom-selector-duplicate-warningCopy head branch name to clipboard