You could put this please to upload several videos and then become one. Thanks, I attach an example
Concatenate two videos
Only if the files you want to concatenate have the exact same encoding settings can you concatenate without re-encoding:
ffmpeg -f concat -i files.txt -c copy output.mp4
In the files.txt file, place urls to the files you want to concatenate:
file '/path/to/video1.mp4' file '/path/to/video2.mp4' file '/path/to/video3.mp4'
You can add -safe 0 if you are using absolute paths. If you miss some frames after concatenation, keep in mind that the concatenation happens on I-frames, so if you don't cut at exactly the right frame, FFmpeg will discard all frames up to the nearest I-frame before concatenating.