Qiqqa is by far the strongest solution for research and managing pdf's. Zotero, named as a comparison is weak as it does not allow pdf;s to be loaded into its interface - you need to use a pdf reader, which defeats its whole purpose. With Qiqqa documents in a library can be searched together. It has excellent maps of your libraries. It is not prefect, having a few glitches, but still is the only one of its kind.
Based on our record, Documents by Readdle seems to be more popular. It has been mentiond 14 times since March 2021. 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.
I use Documents over the files app for most things. I haven't had a problem zipping. But I have never tried to zip files not already on my iPad. Could work for you though. Source: about 1 year ago
You can use https://readdle.com/documents. Source: about 1 year ago
Another option is to download an app onto your iPhone that allows for file transfers using iTunes, like Documents by Readdle. Then you can use the instructions from Apple about File Sharing, but you will see Documents in the list instead of Pages, Numbers, and Keynote like in their screenshots. Source: over 1 year ago
Https://readdle.com/documents maybe this one could do the job for you. Source: almost 2 years ago
Android file managers are basically very similar to how they work on Windows and Linux, the way you expect. But, Apple/iOS does have file management. There's an app called Files and it's... mediocre. If you want file management AND you want cloud files (your next point), you absolutely want the app Documents by Readdle. It's a [local] file manager. It's a cloud manager. It's a document reader (PDF/ePub/etc), and... Source: about 2 years ago
Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
FE File Explorer - The one-stop files solution
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
GoodReader - With GoodReader on your iPhone, iPod Touch or iPad, you can read virtually anything, anywhere.
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .
Documents Pro 7 - The ultimate all-in-one mobile office suite for the iPhone and iPad with 8 premium apps in 1.