QB Issue Resolution:

See this article:

https://community.intuit.com/articles/1578606-attached-documents-are-missing-after-changing-file-nam…

Resolution for Issue 'Attachments lost but show as attached but won’t open.' available: Yes (Solved).
Source: Intuit Community forum.

Attachments lost but show as attached but won’t open.: 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 Attachments lost
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Error Recovery for Attachments lost [Canada]
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Additional Support Options: