I bought a song from audiojungle with Music Standard License. Can i use this music to create two different videos and upload to the same youtube channel?
Typically you’ll need to buy a new standard license for every video you publish on Youtube.
If this is completely different video, not a series of the same video i think you will need a new license.
i want to join the same video twice to make it longer, is that ok?
A standard license is valid for one end product (video). It doesn’t matter if the video is shorter or longer, that’s still a single end product.