Merging sequences and files from one project into another in Adobe Premiere Pro
If you are using project , it is because all projects are built on a different system
With its features, the operating system is embedded. Therefore, while running the project on your operating system, you may encounter messages such as the image below, and you must act on the option that you see in the image.

By clicking this button you can search for your missing files, you can even create a file with missing names and paste it in the project
Also, if you need a sequence, enter the items of one templates in another premiere pro templates First you have to run the main project, then import the project from the file menu to get a message like the one below.

I hope I was able to help
Ask if you have any questions
Good luck