How save a file locally when choosing share on Android ?

Awesome files app - Material Files provides a save as share option. GitHub, F-Droid

Also there's are multiple dedicated save as apps (not in a specific order):

• https://f-droid.org/pl/packages/xyz.myachin.saveto/
• https://f-droid.org/pl/packages/name.lmj001.savetodevice/
• https://f-droid.org/pl/packages/com.mateusrodcosta.apps.share2storage/

There is an open source app called "Save locally". You find it at https://github.com/MateusRodCosta/Share2Storage and on f-droid.

If you have a file manager app installed you should get that as an option for most content (I use Amaze).

Mixplorer also adds the option in the share menu to save the file.

I've used Send To SD Card for years and years.

Though lately I've been relying on MixPlorer.