Hi Aaron
I wasn’t aware that importing a CSV file back is a supporter exclusive feature. Please see more details about CSV downloading and importing below:
All Intervals.icu users can download a CSV of the streams (power, heart rate, cadence etc.) for an activity for analysis in Excel, Google Sheets etc., on the activity data tab. Supporters can also upload the CSV to add or edit data.
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Google Sheets
Do File → Import and select the CSV file. If the activity has any array valued streams (e.g. HRV or a custom stream using array values) then you need to untick the “Convert tex…