The HAMMER CONNECT hydraulic model data is synchronized with the current MicroStation .dgn. HAMMER CONNECT hydraulic model saves are triggered when the .dgn is saved. This is done with the MicroStation File>Save command, which saves the .dgn, .sqlite and .wtg files. If you want to have more control over when the HAMMER CONNECT hydraulic model is saved, turn off MicroStation's AutoSave feature; then you will be prompted for the .dgn.

There are two File > Save As commands in MicroStation. SaveAs in MSTN is for the dgn, and allows the user to, for example, change the dgn filename that they're working with .wtg model filenames in this case stay the same. The Project's SaveAs allows the user to change the filename of the .wtg and .sqlite files, but it doesn't change the dgn's filename. Keep in mind that the dgn and model filenames don't have any direct correlation. They can be named the same, but they don't have to be.