There is an integration , where we upload the documents . But the documents are now taken over http, there is a size limit .
Can anyone help me on how to find the payload size limit .
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Which limit do you mean? In Appian for sending documents, or in the other system for receiving them?
Sent the documents to the other system
https://docs.appian.com/suite/help/23.1/Integration_Object.html#http-integration-definition
Size limitations
Request bodies cannot exceed 5 MB. The file size of documents being sent do not count towards this limit. For base64 files, the combined size of the files in the request body cannot exceed 75 MB. For binary files, we recommend keeping the file size under 250 MB.