Previous it was a DSS MaximumFileUploadSizeMB
@saikrishnaG6683 To restrict the size of attachments uploaded from the attachment control in Pega Constellation, you can still use the Dynamic System Setting (DSS) MaximumFileUploadSizeMB. Additionally, you can use the System Setting (SS) pyMaxDragDropAttachSizeMB. If you want to set a limit higher than 1GB and lower than 2047MB, you should also use the DSS prconfig/initialization/maximumfileuploadsizemb/default first to unlimit the 1GB restriction, and then use DSS repository/maxFileSizeInMemory and SS pyMaxDragDropAttachSizeMB.
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Max file upload size using dynamic system setting
How to change the maximum file size for attachments