To convert a Video

Steps:

1. Import your video from a source: Camera Roll, Photo Library, or Cloud services

2. Wait for the file to load, then press "Convert"

3. Choose the desired output format, for example "M4V"

4. When the conversion is done, your video will be available in the Files Tab.

To Trim a Video

Steps:

1. Import your video from a source: Camera Roll, Photo Library, or Cloud services

2. Wait for the file to load

3. Choose the desired beginning time of your video by dragging the Arrow on top of the slider.

4. Choose the desired end time of your video by dragging the Arrow below the slider

5. Press Convert.

6. When the trim process is done, your video will be available in the Files Tab

To replace Audio in a Video

Steps:

1. Go to Files tab

2. Select or Import a video 

3. On the right side of the video, press the "i" button

4. Select Insert Audio

5. Select an audio. (Make sure the audio file is also imported)