Questions about file storage in Talk

If the files shared in Talk have been uploaded in other directories, will they occupy the same storage space? Another question is, can the name of each user’s Talk directory be modified?

See Settings - Nextcloud Talk API documentation default_attachment_folder

Not sure I understand the question. If the file is uploaded, it will always account to the quota. If it is shared, it does not count to the recipients quota.

Thank you for your answer! I wish you a wonderful day~