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Question:
What are the size limitations of multiple documents stored in a Document Tray?

Answer: 
By product design, the size of documents stored in a Document Tray at a given time is not limited. The only external factors that may limit the Document Tray are the hard drive of the storage location or your organization's DocuWare Cloud storage package. If you wish to impose a size limit on a Document Tray, please follow 
KBA-36883.

KBA is applicable to both Cloud & On-Premise Organizations.