I am attempting to edit a .mlapp file that was created in the R2020b version of app designer. When I open the file in R2018b, app designer gives me the following notice:
In the updating process, all of the UI elements and their associated auto-generated code are removed. Only the user defined callbacks and properties are preserved. The result is a blank app with no functionality.
Here is a "before and after" comparison:
If you want to look at the code, the attached files are the .mlapp file before and after opening in R2018b.
Any suggestions on how I can preserve the UI elements and their code in the updating process?
This question seemed relevant to the problem I am having:
However, the suggested fix (rehash TOOLBOXCACHE) did not work for them or for me.