Susan images should work basically the same way on both desktop or cell, so let us know if you still have problems. I don't know that I have tried on a cell phone so you may have run into something we need to look into.
As to the merits, I think I am in agreement with most of what I have read here. I would analogize this to "trust your eyesight." You know that there are times that your vision is blurry or that there is fog or other reasons that can distort your vision, and require you to check and recheck over time what you are seeing. But sight, regardless, remains one of the canonical faculties and you "trust" it in the sense of "honestly reported" as by a witness in court, using DeWitt's analogy.
I think exactly the same applies to feelings. I think Don's point about reactions is valid but ultimately the words that we understand and apply include feelings, emotions, etc. The main point is that like sight and hearing, feelings are honestly reported to us. They are what they are, and they are to be dealt with accordingly.
Lot's of people advise us to be "in touch with our feelings" and that is a less revolutionary way to look at it but probably similar to what Epicurus was advising.
Probably the main thing to keep in mind is that Epicurus never promises that the canonical faculties, even the five senses, are some automatic and magical gateway to "truth." The opinions we form from our senses are quite frequently wrong at first thought, and maybe even wrong over a lifetime. The same observation applies to feelings. The Canon does not guarantee us omnipotence or omniscience. it is simply and factually the only thing we have that is an "ultimate" faculty for us with which to discover truth. No one guarantees us that we will in fact discover "truths" about everything we'd like to know. The canonical faculties are what are real to us, but that doesn't mean that we are going to use them intelligently.
Over time, and with experience and even training, emotional reactions can become much more accurate, at least for some people. Some people are even known to pay respects to the accuracy of something known as "a woman's intuition" about which I personally know nothing!