IOS and iPadOS no longer have access to Google and Microsoft shared drives/libraries - why?!

At the time of writing, iOS/iPadOS 18.7.2 is current. If you haven't already done so, you should update your devices.

I'm not sure that I fully understand your comments vis "Shared Drives / Library" being removed - or from precisely where these are seemingly absent.

Be aware that visibility of Google Drive and Microsoft OneDrive cloud storage, within the Apple Files App (and associated installed Apps on your iPad), is entirely reliant upon the corresponding [Google] Drive App and [Microsoft] OneDrive App being installed on your iPad - these Apps providing integration with iOS/iPadOS. Unless these third-party Apps are installed on your device, you'll not be able to directly access files stored in these third-party cloud storage providers from Files.

With the corresponding Apps installed on your device, provider-specific cloud file-storage can be accessed by iOS/iPadOS (as determined by the respective App Developer) in addition to any extended access (such as libraries) that is offered from the corresponding third-party App.

When using the Apple Files App, third-party cloud storage providers will be visible from the Files App sidebar:

As an aside, you perhaps need to understand that all contributors here are end-users, just like you. Other than the site Moderators, Apple neither monitors nor participates within these support communities - and as such, your comments posted here will not be seen or acted upon by Apple Engineering official Apple Support personnel.

be.free (Author)

Perhaps the iOS versions may need an update, should they

be not current within their own series; latest is iOS 18.7.3.

{Support article below shows both latest iOS versions.}

However iDevices might naturally be capable of a higher

upgrade to latest iOS26.2, may try and make that jump.

Apple security releases - Apple Support

//support.apple.com/en-us/100100

.Some end-users have/had issue, when/if this happens.

Mine's not capable of upgrade to iOS26.x --it's an XR.

You make reference to using multiple instances of OneDrive and other storage Apps. Perhaps I'm missing something here, but it remains unclear as to what you are explicitly attempting to achieve - and whether or not you are accessing multiple cloud accounts from the same provider.

To reiterate an earlier point, native integration of external cloud storage providers with iPadOS requires installation of appropriate "helper Apps" - such as MS OneDrive and Google Drive Apps. The helper Apps provide the APIs used by iPadOS to access associated cloud storage.

To access files, you must obviously be signed-in to the associated cloud account(s). Both the OneDrive and Google Drive Apps allow you to sign-in to a single account with that provider. As such, you'll not be able to sign-in to multiple accounts, from the same provider, using the helper-App mechanism. This is a limitation of the third-party provider's App; not Apple; attempting to run multiple instances of the same helper-App will not bypass this imposed limitation.

There is a potential workaround - but at the expense of full native integration with iPadOS. Some third-party File Manager Apps offer considerably more flexibility with external cloud services. Instead of attempting to integrate Google and MS cloud storage at an OS-level, using a "helper App", some third-party File Manager Apps can instead access Google/MS and other external storage/cloud providers resources directly. Using a File Manager allows you to sign-in to multiple accounts from the same provider - and as such bypass many of the functional limitations imposed by iOS/iPadOS and cloud provider helper Apps.

If this is the issue that you have encountered, one such File Manager App that may help with your difficulty is FileBrowser Professional by Stratospherix:

https://apps.apple.com/gb/app/filebrowser-professional/id854618029

This is an App that I both use and recommend for use by advanced users with more complex needs for easy access to (and management of) external and cloud storage. Here is a redacted screenshot that illustrates simultaneous connection to multiple cloud providers/accounts, connected USB storage etc and local folders:

You would be well advised to review the extensive online Manual and help files to determine suitability for your needs.

https://www.stratospherix.com/products/filebrowserprofessional/filebrowser-professional-user-guide.php

Perhaps I wasn’t clear. The native Files App doesn’t itself restrict the number of external storage providers or connected USB devices.

The limitations to which I refer are those created by the installed helper-Apps that provide integration with the device - such as Google Drive - that permits you to be signed-in to a single account.

As such, the Files App access one Google Drive Account simultaneously with OneDrive (single MS Account) and other cloud providers / connected USB storage.

Merry Xmas.

-LP