unable to add product/file to completed order

Hi @muhammadnan,

Seems like an issue reported in another thread recently.

Kindly try the workaround explained here: https://github.com/woocommerce/woocommerce/issues/29884#issuecomment-840421600

Hope this helps.
Thanks.

Hi,

We’ve not heard back from you in a while, so I’m marking this thread as resolved. Hopefully, the above info was helpful.

If you have further questions, please feel free to open a new topic.

Thanks.