Applying filter to multiple clips at once

[qtrim]

I have about 50 still shots on overlay track #2 that I would like to apply the same Key Mask filter to. Is there a way to select the whole track or more than one pic at a time so that I don't have to do each one individually?

[Black Lab]

There are two ways I know of, and I'll assume that your project has other clips in it, not just the 50 stills. For demonstration we'll call this Project A

First, delete everything from your project except for the overlay that you want to add the filter to. Render this to a new video file.

Open Project A. Remove the 50 individual clips from the overlay track., Insert the video file into Project A, where you can add the filter to your new clip.

OR

Delete everything from your project except for the overlay that you want to add the filter to. Save this as Project B.

Open Project A. Remove the 50 individual clips from the overlay track. Insert Project B into the timeline of Project A. This "nesting" of a project file into another acts as a new video clip. Add your filter.