There should be log lines with the result of the import. Best practise for Excel documents is always to import the records to an inbetween entity and then use microflows to transport the entities to the real objects. This way you can handle import scenario's better.
But assuming you did your import on your local machine, did you check the database to see if record has been added?
And what are the Excel import template settings? Did you sync or just created a record for each line? Playing with that option might give you more clues on what is going on.
Hope this helps,