Unable to load video from multiple sources into timeline

[Richard354880070289]

I have three video sources that I use.  My cell phone, my camcorder, and my drone.  Actually have use several DJI drones.  All are outputing the MP4 file type.  The phone only outputs that file type for video.  I am able to laod video files from all sources into my project.  However when I start moving them into the timeline they appear incompatable as after I load for example the drone clip and I try to load a clip from another source it will no allow the clip to be added.  I have checked the properties of the source files and they are the same.  All are 1920X1080, all are 30fps. 

How do I get this to work?

[R Neil Haugen · Accepted solution]

Do you have Source tracking enabled for the tracks you want? The very far left of the timeline panel control header block. Do you have blue blocks by both a video and audio track?

[Richard354880070289]

I am still very new to Premier Pro and having to learn everything.  Thank you very much.  I was unaware of the very far left V1 and A1 being something you needed to click on and have blue.  They are now blue and I am able to take different sources of video now.

[R Neil Haugen]

We've all been there! SO many things to learn  ...