Importing files into Texifier iOS from other Apps
This article concerns the

Texifier registers itself with the iOS device it is installed on as a candidate app for opening LaTeX-related file types such as .tex, .bib, etc. This may be used to import a file into Texifier. For instance, when viewing a LaTeX file in Safari or in Files app, you may see an Export button . Clicking this icon will present a list of apps that are capable of handling the LaTeX file. Texifier will be listed as one option. Files imported in this way will be copied to the Texifier-Imported-Files folder in the root of your local iOS storage.