Outbound document reached size limit

Summary:

We are sending documents which are attached on shipment either PDf or image or other formats

Our document content is not going when we are sending a file of 6 MBs as PDF

In OIC it is showing Document content is too large

Can we increase its limit somehow for the outbound document?

Content (please ensure you mask any confidential information):

We are sending documents which are attached on shipment either PDf or image or other formats

Our document content is not going when we are sending a file of 6 MBs as PDF

In OIC it is showing Document content is too large