Creating and saving a transport form will not release the transport in the development system. To release the transport you need to find it within TE and release it manually.
It is good practice to release the transport sub-tasks in SAP as this will identify most issues within SAP and reduce the number of release failures in TE.
Transport Express by default will import transports in the order in which they have been released so this should be considered when releasing.
Select the transports you wish to release. CTRL-A will select all the transports in the list.
Right clicking or choosing the menu option Actions -> Release will perform the release of the selected transports.
If the release fails in TE an error or warning will be displayed along with the relevant details. If the failure is due to a warning the release can be retried in TE but if an error occurs this will need to be investigated within SAP.