Click the file dialog below and select your ATT or MM data files. By default, they are located in %userprofile%\Documents\Elder Scrolls Online\live\SavedVariables.
You can upload multiple files at once, but can't upload MM and ATT files at the same time.
Only upload files called either ArkadiusTradeToolsSalesDataXX.lua or MMXXData.lua, where XX is replaced by digits.
They will be converted to CSV which can be viewed in Excel or similar software.
These files are not uploaded to the server, they remain on your computer and are processed inside the browser.
If you run into any problems, you're on your own for now. This is experimental.