LeafPic is a fluid, material-designed alternative gallery, it also is ad-free and open source under GPLv3 license.

Components

The section of the software that im suggesting is on the Drop-down Menu on The Top-left portion of the software
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Proposal

My Proposal is to Remove the "Local Files" selection and Add Two Selection which is "The Internal Storage" and The "Removable Disk or SD Card Storage" depending what was it's name , This should be enhanced because this would give the user an ability to show only the photos to which drive the user wants and at the same time he will be able to see the disk size in realtime and how much size thus the photos are using from the total storage size .The user would be able to know if he needs to erase some not so important photos or move it to another disk drive.

Mockups / Examples

Benefits

Once my Proposal will be implemented. This feature will be truly loved by the users
The added features would create more detailed information to the mobile of the user
Instead of going to the default file manager , The user can also see the information of how much remaining space does he/she have