Import Tools - Items not showing in transaction forms

After successful importing item by Import tool with Submit after importing checked, I am not able to get these items in purchase order and other transnational forms.

I followed this link but no success.

After importing Items, I got the message:

File Upload Disconnected. Please try again.

nothing display in console.

and in my Item detail form its shows below message, although I put default warehouse and opening stock:

Currently no stock available in any warehouse

Also, I try to create Material Receipt entry in Stock Entry form, but same issue.

Please let me know how I can get these import items in my transnational level.