QB Issue Resolution:

Sharing permissions need to allow writing on the external drive. Is the drive formatted as HFS+ (you can check in Apple’s Disk Utility)

Resolution for Issue 'QuickBooks does not have write permissions for this folder. Please choose a different folder' available: Yes (Solved).
Source: Intuit Community forum.

QuickBooks does not have write permissions for this folder. Please choose a different folder: 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.

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