Yes. Simply select the desired documents and press check at the upper right corner. You can also select all documents with the same label at once. Your documents will always be checked one at a time in order to account for collusion. For uploads containing several documents, PlagScan waits with the start of the first plagiarism analysis until each document upload has been completed and is available in the database.
You can find all your invoices in the billing section of your account at www.plagscan.com/billing after you have logged in. Please note that this overview is only available to organization users. Single users receive their receipts by email after purchase.