QBO lost six months of transactions in 2024 and will not accept any manually uploaded format — QBO / CSV / TXT etc.

it goes through the uploading process and (1) with a QBO file it tells me to go reconcile as if everything uploaded or (2) with a CSV file it never progresses beyond step 4 - accepting negative and positive values.

both steps result in no transactions being uploaded.

i have tried in multiple browsers and multiple file formats as mentioned — nothing is working.