Importing schedules from P6 ver7 with baselines into OPC 24.7.2.0

Hi, trying to convert all of our schedules from P6 to OPC and I am having difficulties with those schedules that have been baselined.

I have exported the schedule and the baseline from P6 to .xer files.

I have imported the schedule itself successfully into OPC. However I am not able to import the baseline .xer (I can import into OPC as a schedule). I do not see a spot for me to Import existing baselines into an existing schedule. I have read through many forum comments and nothing is working.

When I go into Schedule > Baselines > Add, there is no spot to select an attachment