Go to the Enter Coins page of Cointracking and click on the Export button. Now select JSON Download.
Or click the Start JSON Export button on the Trade Export page.
What needs to be considered when uploading the JSON file?
Before uploading the file you should make sure that you have downloaded the file from Cointracking in JSON format. The file should end in .json. If this is the case, you should be able to upload the file without any problems.