QB Issue Resolution:

I currently received a communication that some users are not able to attach an Excel file to the sales transactions.

Let’s first make sure to remove the extra space just before “.<ext>”. file name.

For example, the “filename .pdf” needs to be renamed as “filename.pdf”

If same issue persist, I recommend contacting our Customer Care Team. Our specialists can review your account and help check why this is happening.

Resolution for Issue 'ATTACHMENT For security reasons, we do not allow you to upload this type of file' available: Yes (Solved).
Source: Intuit Community forum.

ATTACHMENT For security reasons, we do not allow you to upload this type of file: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for excel file
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