Zend certified PHP/Magento developer

Can’t download PDF invoice, getting a “network failure” error. Magento ver. 2.3.4

I am trying to download an invoice via “Print PDF” in one of my orders. But I’m getting the error “Failed – Network error” in Chrome, Firefox and Edge.

How can I fix this so I will be able to download an invoice again?
If I need to facilitate more information, let me know.