Based on our record, LyX seems to be a lot more popular than FileApp. While we know about 15 links to LyX, we've tracked only 1 mention of FileApp. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
The names are similar. That is Apple ios Files app you referred to but the one I am looking for (paid for many years ago) is FileApp at https://fileapp.com. Source: over 1 year ago
You can use LyX. LyX self-describes as a What You See is What You Mean editor, basically a fully graphical editor for writing LaTeX. Source: 12 months ago
Directly typing LaTeX gets unwieldy for longer and more complicated expressions, so I write those in LyX first and then copy-and-paste the LaTeX code into Obsidian. Source: about 1 year ago
I like LyX. It's not for everyone, but damn it can be effective. Source: over 1 year ago
An upopular opinion perhaps, but I'm a huge fan of the WYSIWYM editor LyX. Source: over 1 year ago
I don't think LyX devs will notice your point here, alas. You could consider writing an email to the devs email list found on lyx.org. Source: over 1 year ago
Documents by Readdle - A central hub for all your files.
Overleaf - The online platform for scientific writing. Overleaf is free: start writing now with one click. No sign-up required. Great on your iPad.
Filza File Manager - Explore files and folders with list view or grid view. View / edit files with powerful viewers.
TeXstudio - TeXstudio is an integrated environment for writing LaTeX documents.
FileBrowser - FileBrowser is a multifunctional file manager for the iOS devices that are used for accessing files in both local and networked environment.
Texmaker - Texmaker, free cross-platform latex editor