A few things to check:
AncestryDNA files: Upload the original .zip file directly. Don't repack it into a different format.
FamilyTreeDNA (FTDNA) files: If your file is a .csv.gz, try unzipping it to a plain .csv file first, then upload that.
CircleDNA files: These files are often very large and poorly formatted, which can cause uploads to stall. Contact us and we can upload it manually.
Very small files (under 1 MB): Your file likely doesn't contain enough genetic markers. We need at least 600,000 markers. Check that you downloaded the full raw data file from your provider.
If none of this helps, contact us — we can often fix file issues on our end.
If you have a Genomelink account, go to genomelink.io/profile/contact and contact us from the form — we can help faster by checking your account log.
If you're a new user without an account yet, email us at info@genomelink.io.