I had a 3 month multi-entry Schengen visa issued by Spain. When I applied for it, it was suppose to be a business trip but later trip was cancelled but I still had a visa so I was like why to waste.
My first port of entry stamp was from Frankfurt from where I took a bus to a Ryan Budget Domestic Airport nearby to take an internal flight to Spain (no stamping happened in Spain). From Spain after few nights, I went to few more countries ensuring not to spend as many days as I did in Spain.
Eventually I went to London and then came back to Frankfurt (technically my second entry into EU on Spanish issued visa) to pick my bags and exited in few hours to America.
So technically, during my first visit of multi-entry, I did spend max days in Spain. But the thing is my passport doesn't have a Spanish stamp (internal flights, no border control) hence two entry stamps from Germany, one (first) exit stamp from Sweden (while going to London) and one (second) from Germany.
Now, I am applying for another Schengen visa from Spain. Should I add proof (flights and train tickets) stating I did stay maximum time in Spain (because stamps might tell a different story) or do they have a way to track internal flights and already know that or they won't care (I have good financial background and have travelled 20 countries)?
p.s.: I am an Indian (country with higher scrutiny for visa than normal)