We can manually Refresh your bank account to pull those transactions into your QuickBooks Self-Employed (QBSE) company. I'll be helping you navigate through this process to ensure you can retrieve those missing transactions, Javier.

1. To begin, these are the steps:

    

   1. On the top right corner, click the Gear icon.
   2. Select Manage accounts and locate the bank that's connected to your account.
   3. Click Refresh all to refresh your bank accounts.

For visual reference, see the image below.

Also, it's essential to understand that QBSE relies on the data or transactions provided by your bank. That said, you'll want to review transactions in your account and compare them with what you have in your bank statement. 

In case the missing transaction is part of those you've downloaded and it still hasn't appeared in your account, you can consider manually uploading it to your account. Refer to this article: Manually import transactions into QuickBooks Self-Employed.

If you have already uploaded a missing transaction and it also gets downloaded by your bank into your account, you can exclude it to avoid duplicate transactions in the program. For more detailed instructions, please visit this page: Exclude or delete transactions in QuickBooks Self-Employed.

On the other hand, here's an article to help you in categorizing transactions in QBSE: Schedule C and expense categories in QuickBooks Solopreneur and QuickBooks Self-Employed.

I can also assist you with filing taxes once you have completed your Schedule C in QuickBooks. If you have any other questions about the program, please let me know in the comment section below, and I will respond as soon as possible. Stay safe.