There are a bunch of complaints on this forum surround the PDF viewer/editor built into OneDrive. I also see similar PDF issues in OneNote.

One way to handle these is to let us use another PDF viewer/editor (e.g. Xodo) natively inside OneDrive. This means if I open a file from OneDrive and make annotations using Xodo, the file gets saved back to OneDrive directly. Without me having to save it to the tablet manually, then upload it to OneDrive manually and delete the unedited copy of the PDF from OneDrive.

Another option is for Microsoft to develop it's own full-featured PDF viewer/editor that addresses all of the issues others are highlighting in this forum. This doesn't seem to be a great use of Microsoft's time given that there are many other nice PDF viewer/editors out there and Microsoft has lots of other things to do (make OneNote, Teams, Planner, etc better).

A very simple use case example is that I need to sign documents often and I want the creator of the document to be able to put it out in a OneDrive/Sharepoint folder the team shares. Then I can open OneDrive on my Galaxy Tab A w/ S-pen, pull the PDF up in Xodo, sign the document, then close and the person can go right back into OneDrive and retrieve the signed doc. Wondering why this is so hard? In our ever more paperless world is no-one else doing something like this?

*English follows Japanese

■Title(件名)：
OneDrive for Business にアップロードしているファイルのオフライン アクセスの動作について
Regarding offline access behavior for files being uploaded to OneDrive for Business

■Description(内容):
現時点での、Android 版 アプリにおいて、OneDrive for Business 内のアイテムにオンライン環境で一度でもアクセスを行った場合、アイテムへのアクセス情報がキャッシュされ、[オフラインで保持] の機能を利用しなくても、オフラインの状態で当該アイテムの閲覧が可能な動作である。
上記でキャッシュされた情報は、OneDrive のキャッシュクリアや、端末の再起動では解消できず、アプリのサインアウトとサインインを行わない限り保持されてしまう状況のため、OneDrive for Business の標準機能として、オンライン環境でアクセスしたファイルに関するキャッシュが保存されないよう制御するための機能の実装を要望します。

Currently, on the Android version of the app, if an item in OneDrive for Business is accessed online even once, the access information for the item is cached, and that item can be read offline without using the “make available offline” function.
The aforementioned cached information cannot be deleted by restarting the device or clearing the OneDrive cache, but only by signing out and signing back into the app. Therefore, please add a function to prevent files that are accessed online from being cached as a standard feature.

Add a setting to restrict the Clean Up Space feature to only remove files that are older than a specified number of days. Below are some situations potentially addressed by such a feature.

I often find that I want to share a recent photo/video that was cleaned off my device already. Especially if my photos are set to sync over wifi (without waiting for the device to charge).

Sometimes the notification asking to clean up space pops up moments after taking a video/photo. This can be annoying at times, especially if I'm in the process of sharing it while also having lots of older files I would like to be cleaned.

I've also noticed that some gallery apps or apps that contain a photo/video gallery (like whatsapp) seem to cache thumbnails of recent media and behave oddly if the device was recently cleaned.