It works for me, Electrum 4.1.4 and ColdCard 4.1.1.
Is your ColdCard on the correct file format? Assuming that you do not hold anything sensitive on your SD card, you can try formatting it. Do backup anything you want on the SD card first. Afterwhich, go to Advance>MicroSD Card>Format Card. This will remove everything from your SD card and use the correct file system.
I formatted the card and created a new skeleton wallet as well and still the coldcard doesn't read the psbt file on the microsd card.
Does it have anything to do with the number of inputs and outputs on the transaction window at all? It says 25 inputs and 1 output. Probably irrelevant, but I don't know what else to focus on. Like I said, this happened last month to me, and I simply updated my version of electrum, after which the coldcard read the psbt file.
Now it seems nothing works. Coldcard version is 4.1.1 and electrum is 4.1.4.