I'd recommend not making empty posts like that just to save a space. Threads come slow anyways.
If you need a place to prepare posts there is a save as draft option in the full reply box.
Ah when you do add the remixes It is possible to add them to a list on links and such in the first post then let people know in 1 new post while waiting on conversation about it. That you don't have to make 40+ sort of redundant posts
Or well it's what I ended up doing since I don't like double/triple/quadruple posting since it can get to be a bit much/Also frowned upon anyways.
Next empty post like this from anyone i'll probably have to lock because it would technically count as spam till it does have content it intended to have.