Limit on the Vauting_data documents

Is there any limit on the number of documents which we can upload to Eoriginal vault by specifying the vaulting_data.

We are able to upload the documents upto 8 in a single transaction but when we try to upload more than 8, we are getting error from the OneSpan APIs.

Unable to update package settings. Exception: The remote server returned an error: (500) Internal Server Error. HTTP PUT on URI https://sandbox.esignlive.com/api/packages/package_id. Optional details: {"technical":"EsepCommand failed and no fallback available.","messageKey":"error.internal.default","message":"Unexpected error. We apologize for any inconvenience this may have caused you, please try again. If the problem persists, please contact our support team.","code":500,"name":"Unhandled Server Error"}