First of all I submitted a feedback request about the companion app and they just told me to post it on the forum, as if they look at these 
Anyways, they should make it so you can filter on only sellable items in your inventory on the companion app. That would be such an upgrade. Also, as we all know, the app doesn’t always show the inventory accurately. Often repeats players and doesn’t show everyone you actually have.
Additionally some items that are no sell don’t say they are until you click on them, whereas others have the no sell sticker on the top of the item. These improvements would be massive!
Try to give this company benefit of the doubt but man, their app is not great and launch of 26 has been so bad. Wish there could actually be competition in this space, but MLBPA licensing obviously makes it impossible for another company to take a crack at it.