Most of the contests rules state: “The number of Submissions submitted by each participant to the Contest is not limited.”
Some contests do have a limitation of submissions, which will always be stated in the contest brief and rules. Please read them thoroughly.
If you would like to submit several media for the same idea, please combine them into one single document such as .PDF to show your presentation. Please always respect the pages limit.
If you submit several ideas - each of them has to be submitted as a separate entry.