I get some doctors notes because that’s one of the options in the menu but they tell you that those notes go to my PCP, my cardiologist, my cardiovascular surgeon
Any doctor that is dealing with my condition. I have a pulmonologist that doesn’t have a portal at all. These records are sent to my PCP every time and if it’s a heart issue my cardiologist will also get a copy. I’m a diabetic and my PCP handles that. I’m only type II so a pill will do.
There shouldn’t be a conflict because MyChart is independent. So you could have all three. If Mayo and Alina are linked together and they use MyChart then that’s ok but even if they have portals that they control you can connect them to MyChart plus any other organization as long as they all use MyChart.

Emergency departments in the 4 hospitals I’ve used all know I belong to MyChart and they digitally send the information to MyChart and it’s almost instantaneous.

As soon as I’m discharged from the hospital I go home and (if I’m feeling well) go to my phone and the MyChart icon in my phone’s app home page and open it. It’s great. I can take my time as I am no longer in a chaotic emergency room. Doctors notes and a summary plus your discharge information is all there. It even lists the meds they gave you while there. I use my local White Cross pharmacy and the doctor sends any prescription straight through their laptops and my meds get delivered to me home within 4-5 hours.
My dentist is listed on my PCP’s portal because they both use their version of MyChart. You can play with the app . Don’t worry, doing so will not cause a conflict. Mayo and Alina may use the same portal that you linked them both on. Nice part is that MyChart is totally free.