To resolve a file import problem, check the Excel template from "Shipping", make sure the data is properly formatted, respect the line limits, and check the file size (not exceeding 25 MB, extension .xlsx).
Make sure that the Excel template comes from the "Shipping" section.
Check that the data in the file is correctly formatted (for example, telephone numbers and postcodes starting with 0).
Make sure that the file does not exceed a certain number of lines (indicated according to the limits for labels, CRs and contacts).
Check that the file size does not exceed 25 MB and that its extension is .xlsx.
Parcel shipping for business and private customers / What should I do if I have a problem importing a file?