It would be so nice to be able to bulk create custom object records and at the same time associate all of the contacts we want associated with them. However, the process now just creates duplicate custom object records when uploading a spreadsheet containing all the individual contact records associated with it.
Now I have to first create the individual custom objects, then manually input each record ID into my spreadsheet, and then re-upload all the data. Possible, but a lot of extra manual work.