HAR (HTTP Archive) is a file format used by several HTTP session tools to export the captured data. The format is basically a JSON object with a particular set of fields.

Procedure on how to generate HAR file for different browsers can be obtained at - https://toolbox.googleapps.com/apps/har_analyzer/

Please capture data relevant to the issue only and request Uptycs support to provide you with a secure location to upload the HAR file as it may contain sensitive data.