The quality of the video is poor after editing

In my Storyline project, I would like to edit one of my videos. After saving my edited video the quality of the video is really poor, as the video tool settings automatically changes from Compression: None to Compression: Automatic. I cannot change this setting as this field is greyed out, see attachment.

Before the edit, the quality of my video was quite ok. After edit, I cannot use it. Is there any way I can keep the setting to Compression: None even after editing?

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