Hello!
I would like to edit and run a DTSX package created on an older SQL Server (2012) in a "new" SQL Server 2019 SSIS project.
Requirements:
I have an MS SQL Server 2019 running (on a Windows 2019 DataCenter Server).
VisualStudio 2017 (Microsoft SQL Server DataTools [SSDT]) is installed on the SQL server.
In VisualStudio I created a new Integration Service Project (SSIS). But I can't find a way to import the DTSX package so that I can display the individual objects graphically and edit them again.
When I open the DTSX package by double-clicking it in Visual Studio, I get the individual objects, data connections, etc. displayed correctly, but I cannot run the project (only Append instead of Run is offered) or save it as a (new) SSIS project.

How can I transfer the DTSX package back into an SSIS project?