Situation:
1. Open Proton Drive on my iPhone 15 and let it upload my camera album (both photo's and videos).
2. Open drive.proton.me in a browser and download all uploaded photo's and video's to my Windows pc.
3. Extract the archive.
4. Some of the videos have "_modified" added to the file name. This means that Proton Drive had modified them somewhere in the process, what I don't like. I want the original files for the best possible quality.

There seem to be different scenarios:
1. Slowmotion video's are downloaded twice: once in the original version (eg. IMG1234.MOV) and once in a special slowmotion version (eg. IMG1234_modified.MOV). This is fine.
2. Only the modified version is saved. I have no idea why. For example: I recorded three video's, from the same spot and settings, just minutes after each other. Two of those got modified, the third one didn't. Maybe it has something to do with me taking a picture during the recording (default functionality in the default iOS camera app).