Hello @hey2495,
Welcome to the Maxon developers forum and its community, it is great to have you with us!
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About your First Question
I would try closing the file into which you imported the Alembic file. I just checked it, when I import any Alembic file, Cinema holds a lock onto it while the file into which you imported is still open. That seems to be an Alembic specific behaviour, not to say a bug. But it should be avoidable by simply cloning or merging the imported document, so that you can close the import document.
I will give the exchange team a heads up on this.
Cheers,
Ferdinand
