[Feature Request / Bug] Import text files via Open With / File Picker / Share menu

[dwughjsd]

I need to import multiple markdown files created by other apps and a convenient way to import files will be a big help.

There are 3 ways that I think to be useful for me.

1. System file association. With this function, files from other apps can be simply imported by opening it with Open Note.
2. In-app file picker. It will be good to support multiselection and/or (recursive) folder importing. This app currently does not support in-app subfolders, but if it does so in the future, and it would be better to preserve the directory structure of the imported folder.
3. A "send to" shortcut in the share menu. It currently only support .txt, not .md files, and is nonfunctional now for txt files. The app is launched, but nothing imported.