Can I delete my Pond5 track and sell exclusively elsewhere?

Hi everyone, trying to work out this scenario: I upload a track to Pond5, it makes one sale. Can I now delete it from Pond5 and sell to an exclusive library? It looks as though the answer is yes, but not sure if the library will object that the single customer now has a right to use the track in perpetuity so I don't have control over the rights. If it's OK, then the temptation is to stick all my library tracks on Pond5 as an interim measure since many libraries take ages to actually publish stuff. Of course there's also the issue that I'll have registered it with my PRO, but I imagine that's not hard to re-assign.

Thanks for any advice,
Vyv

For me it just doesn't feel right even if you can do like this. Library music is a long term business, better not mix oranges with apples.
Would you like to work with a composer who worked this way if you were the owner of the exclusive library?
Maybe better to work opposite. let's say you have a contract for 2-3 years and they have not licensed the track. Well, maybe you should go non exclusive with those tracks or try with another library.

Perhaps I overstated it a bit; on reflection, no I wouldn't post tracks in bulk to an non-exc while waiting for the exclusive version to come out. I'm really talking about odd/surplus tracks that I might upload to Pond5. If, say, Taxi or an exclusive library I've worked for suddenly need that kind of track at short notice, am I OK to take it down from Pond5 and send to them?

I think you have to decide from time to time and do what you think is best when it happens.