Here comes Image and Video Date Fixer to the rescue. It can read the creation date of images and files from its metadata and set that as file modification date.
In case your images do not contain EXIF Metadata but contains the date in the filename itself Image and Video Date Fixer can even parse filenames to extract the date and set it as EXIF date attribute. For videos only the file modification date will be set based on the dat.

The free version allows to process 100 files per batch.
If you want to process more files per batch you can buy the premium version via an in app purchase.

Attention:
Due a bug in the Android Framework fixing the file modification date will just work on Android 9 upwards. In some cases it might also work on Android 8 for some manufacturers.

Note:only works for android 8 and up
Release by LunaDev

What’s New:
Getting rid of kitkat users (nearly 7 years old!!!) and older where the app does not work due a bug in the Android Framework.
Fixed files search dialog not showing
Fixed file modified date not being set when parsing date from filenames
Increased files that can be processed to 100 in the free version.

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More Info:

Download Instructions:
dropgalaxy.in/i5aczzqqqxvu

Mirror:
dropapk.to/y0ihwosenjkf