FM-File modes
Filemanager supports multiple file modes but not all of them. For other file types kindly use blenders default methods.

Refer to structures and Conventions to get familiar with the terms used.
Follow naming convention: your asset top collection name should match the <contextTypes> folder name. So the "Append" and "Link" file modes work.
Default
Default is regular ".blend" file. For both "Open" and "Save". It saves the file with <contextTypes> folder name.
"Open" replaces current blender and you lose any unsaved progress.
"Save" doesn't save blender edited images, save them separately.
Append
For open, it appends the collection with <contextTypes> folder name to the current scene.
Export
Exports selected collection and saves it as a ".blend" file.
Animation
Save> Saves the animation.
Open > imports the previously saved animation on to selected rig.
Link
Links a collection with <contextTypes> folder name to the current scene.
FBX , OBJ, Alembic
Imports and exports selected file types to the current scene.
UI_settings
Loads and saves Filemanager UI state so it will be easy to browse the next time you open blender.
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