What happens after I choose a file?
The file is unzipped and read right in your browser, and you get a preview of what it contains and how many readings are new versus already imported. You then tick which streams to import before anything is saved. Large exports with many FIT files are processed in batches, and the import keeps running even if you navigate around the app.
The large export file never leaves your computer. Only the extracted readings are sent to be saved, and the file itself is read once and discarded.
You will get a clear message rather than a silent failure. Double-check you uploaded the original export file; some apps re-zip or rename downloads in ways that hide the contents.
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