Hi,
First of all, thank you for helping me.

I have an issue with uploading new leads to Salesforce. I used the Data Import Wizard.
The upload csv includes also thousands of leads with different owners and their IDs.
After I uploaded/updated existing leads, the owner ID changed from other owners to me (as creator).
There should be no change of lead owner id after the download.

Does anyone have a solution to this problem? THANK YOU!
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Best,
Thomas