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Is your feature request related to a problem? Please describe.
The current file picker is very basic at the moment – after talking with @jospoortvliet about it we identified some improvements:

Describe the solution you'd like

• File picker: use same sort order as in the main Files view #39185
• File picker: remember last location/folder you were in, not start in root folder every time #39186
• File picker: ability to filter #39187
• File picker: left sidebar with the favorite folders for quick jumping #39188

What do you think @nextcloud/designers – any additional points, and who is interested in doing mockups for it? :)