This usually means one or more numbered parts are missing from the folder, or the download was interrupted and a part is corrupted.
The software will automatically detect and "stitch" the remaining parts together to reconstruct the original file. Common Troubleshooting FAZFtAmUtplK.7z.001
To extract the contents, you must have numbered parts of the archive in the same folder. This usually means one or more numbered parts
Ensure you are opening the .001 file. If you try to open .002 or subsequent parts directly, most programs will return an error because the archive's "header" is only in the first part. FAZFtAmUtplK.7z.001
On Android, you can use apps like ZArchiver or RAR to handle split 7z volumes.