I'm specifically refering to Angels etc. Do you believe Angels can appear at times in a form that we can detect, and then change into a form that we cannot detect/vanish ?
I'm addressing specifically things which relate to the interactions of Yahweh, and Angels etc. and if you answer the above questyion i'll have a better idea of how you will suggest these Angels appear, at times and are detectable, and at other times aren't ( visible and detectable)
Everything concerning the electromagnetic spectrum is detectable ( or at least the things we've detected are

) and yet according to the double slit experiment we still don't have a completely understandable data set in the realm of photons, as yet.
Are you maybe suggesting that Angels operate inside our currently varifiable/detectable experimental dimension, at all times ?
Concerning whether or not a being can appear and vanish, etc and so forth, and do what many would call what "angels" may or may not do ... I don't typically like stating my own beliefs in generalized format, unless I'm willing to back it up with at least examples from my own life and tell those examples as to why I believe such and such a thing. Having said that, yes I believe it's possible for *beings* to do such things. I'm keeping it generalized because I'm answering your question in a generalized format. And yes I have anecdotes, but I'll probably not type them out unless someone realllly wants to hear them. I can be long winded of course
But what I'm not saying, is that it's not possible to detect what they are, or that they didn't take place in "this reality", etc. In all my experiences, I believe those experiences take place "in reality" lol. Apart from experiencing them directly or those involved in experiencing such things ... it should, in theory (for the lack of a better expression), be detectable. Imo. What is reflecting in reality, IOW ... assuming it's really happening ... can be observable, etc. If it's merely taking place in someone's mind, or there is no credible reason to assume it's not taking place in someone's mind ... hallucination, delusion, etc can be put forth as possibilities. They are still taking place in reality however: they are just all taking place in one's mind. We may not have the current tech to be able to translate image for image another person's hallucination lol, but we can infer medically certain things about a person who may or may not be hallucinating based on a variety of factors. If the event is *actually* taking place, not a delusion, and has a more difficult explanation to be considered, just because we cannot yet explain fully the mechanism behind what is being observed, doesn't mean one needs to make the leap to "it's outside reality" either. To do so ... one may miss a more mundane explanation still, or furthermore, what if it actually IS taking place and is a phenomena we have yet to collectively explain or understand ? Making the leap to "it's outside reality" seems a stretch, because not only does it render it meaningless and offer up a Deus Ex Machina type explanation that isn't satisfactory, but it doesn't fit the evidence: whatever it is, it IS taking place in reality. Be it delusion, mundane explanation, or something more potentially exotic. I just don't get the "We need to start making up new contradictory concepts to explain stuff," route. Something nothingness, and outside of reality reality. I don't see where it's necessary.
Like bringing up "it's from another universe" for example. Suppose you have another universe in existence, one very similar to our own. A variation of the MWI here ... for it to truly be "another universe" that is completely outside of our own, the two can arguably not interact. This is one argument concerning this POV ... the two cannot interact, because once they do, they no longer are separate universes. They are joined, if at no other point, in the chain of causality. So even if something crosses over from one universe into the other, at that point in time, they are joined. Like a bridge joining two landmasses. They are separate land masses, but reside in the "same reality". Destroy the bridge, it doesn't matter ... the effect is there: there is a moment in the causal chain, where something from the other universe, came into "our reality" or whatever.
From our perspective, on a classical scale, causality remains unbroken as far as we know. The black hole information paradox, and perhaps some others at times, have questioned whether or not causality breaks down in the classical environment, but as far as I know, causality is maintained. It breaks down arguably before the Planck era (by some theories), but so do physics as we know them in general. Regardless, in our reality NOW, we experience causality in an unbroken chain, arguably.
So if something interacts with our causal chain, it's part of our universe, part of our history, etc. To say it's another reality is misleading ... because it has a moment in time where it interacts with OURS. And since we do not know precisely the origin of all things, how can we know for sure that such a universe didn't exist and interact with us at another point prior to our known causality ? Our place in the causal chain essentially, imo, renders an understanding of an ultimate origin meaningless from an objective standpoint.
Thus, "another reality" is somewhat irrelevant and meaningless. This is one argument. For it to be another reality, or another universe, it CANNOT interact with ours in any form or fashion, otherwise it is part of our reality. Those points are evidence of this, if for no other reason, the causal chain we currently experience. Once there is an event, the two are linked. Can they be different ? Sure. Can rules apply in one that don't necessarily apply in another ? Sure, why not. We already have the quantum environment and the classical. But are they "separate realities" ? The argument could be made that they are not, because they interact lol. They share moments in the causal chain. Etc and so forth. So long as they do not interact, or share causality, then they can remain undetectable and separate. And also potentially meaningless and irrelevant.
I'm not saying this is the only perspective one can have, I'm saying it's one such argument. I don't see why the leap is made to "It's outside reality," etc and so forth.