Saving files in App Designer

Hi, I am trying to save my document and I want to save my Table variable as the name I wrote in my EditField

savein=uigetdir(Name of the location);

str=strcat(savein, {'/'}, app.EditField.Value);

newstr=char(str);

Table = strjoin(app.Clasification.Data)'

newName = input (app.EditField.Value,"s")

S.(newName) = Table

save([newstr '.mat'],'-struct','S')

And I get Invalid field Name: ' '

Please help