There is a qbo app on your phone that helps you do this.

I, personally, use Hubdoc.  So simple to .upload

Resolution for 'attaching receipts issue: 'attaching receipts to transactions' available: Yes.

The attaching receipts 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 attaching receipts issue yourself by looking for a resolution described in the article. If it is a complex attaching receipts issue or you are unable to solve the issue, you may contact us by clicking here or by using other attaching receipts support options.

For more information about resolving issues related to attaching receipts in Quickbooks/QBO or to get support for the issue 'attaching receipts to transactions', click the link below: