I transferred some Hyperlapse footage to the phone from the Action's Micro SD card with a OTG cable and no matter in which folder the files are stored the DJI Mimo App doesn't appear to the able to recognise them and never shows them for editing.
The odd thing is that the DJI Fly App can see them and I am able to edit the files, but that editing tool has some restrictions like the position of text being always in the middle of the screen.
If can open and play the files from file explorer and the DJI Fly App can edit them, what is the explanation for the DJI Mimo App which is supposed to be the native App for the Osmo Action?

Hello PauloSeth, I'm sorry for the trouble this has caused you. May I know  the make and model of the mobile device you are using and the format for the videos?

Selected mobile devices can edit a 4k60p video and currently, most of the Android devices are still not capable to edit it.
Have you tried to use the DJI Mimo App to download the video to your mobile device.

Please keep us posted for further help and thank you.