In subfolder under current folder

The following setting does not get stored when activated on iOS/iPad Pro

Options/Files&Links/Default location for new attachements/In subfolder under current folder

If I activate the setting. Leave the options and come back it‘s automatically switched to: Same folder as current file.

Latest version of Obsidian as of Aug 20th 2021.

Please, post a screen recording of this happening and also which version of obsidian mobile you are on.