After adding a custom asset to your portfolio, you can manually add its price. But if the price history has many dates, you can download a history report separately.
The format Snowball report must be in CSV or XLSX and contains the base columns of the custom report. You can see more details here.
Download an example of a filled template in CSV format
Download an example of a filled template in XLSX format
In the Event column, the price history transaction will be called:
CUSTOM_HOLDING_PRICE
In the Exchange column, the following should be filled in:
CUSTOM_HOLDING
In the Symbol column, the ticker of the custom asset is to be filled in.
The Date column should have the date in the format YYYY-MM-DD
When you download a report with price history, a warning will appear that the file does not contain data. Ignore this warning, the prices will be imported successfully.