Save individual (media) files manually
First, tap-and-hold the desired (media) file in the chat. Then, open the menu via the three vertical points and tap on "Save".
Starting with Android 10 and Threema 4.5 for Android, (media) files are saved in the following directories, depending on the file type:
On Android 9 and below, the media files are saved in the directory “Threema/Threema Pictures” (or “Threema Videos”/“Threema Audio,” depending on the file type). Files are saved in the device’s global “Download” directory and can be accessed using the Downloads app.
Automatically save incoming media files
In Threema, navigate to “Settings > Media & Storage,” and activate “Auto-save to gallery.” Automatically saved media files are located in the same directories as manually saved media files, see above.
