The stock apps on any device are there to get you by until you find something better.
Simple Mobile Tools is a great collection of utility apps for Android.
In your case, I recommend Simple Gallery Pro and File Manager Pro.
Also, you will want Simple Thank You, as that will correlate your color choices between all Simple Mobile Tools apps on the device.
They are all available on the normal app stores, and Pro versions are paid apps.
All of them are available for free on F-Droid.
https://f-droid.org/en/packages/com.simplemobiletools.gallery.pro/
https://f-droid.org/en/packages/com.simplemobiletools.filemanager.pro/
https://f-droid.org/en/packages/com.simplemobiletools.thankyou/
If you like these, then check out the other apps available from the same developer.
https://www.simplemobiletools.com/