There can be multiple factors why OneDrive is stuck on preparing to upload.
For example:
What if OneDrive says that Sorry there is a problem displaying this folder?
This post contains all the solutions you want.
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How to Fix OneDrive Hangs with Preparing to Upload
Fix 1.
Updating it is a necessary step.
Fix 2.

Pause and Resume Syncing
Pausing and resuming synchronization can reconnect OneDrive and then smooth the process of file upload.
Here is a tutorial:
Step 1.
Navigate to your OneDrive from thetaskbarand open it.

Step 2. select thegearicon at the top right corner, expandPause syncingand choose a pause time.
Wait for a few minutes and then tap on the gear icon again.
SelectResume syncingto start the upload again.

Fix 3.
In addition, check whether the file types are invalid or not.
Fix 4.
So, its time to manage your OneDrive storage andfree up system drive.
To free up your hard drive so that OneDrive can run properly:
Step 1.
PressWin + Eto bring upFile Explorer.
Scroll down to find the system drive and right-press it to choosePropertiesfrom the drop-down menu.
Go to theGeneraltab and click onDisk cleanup.
After freeing up OneDrive and hard drive, peek if OneDrive stuck on Preparing to Upload still exists.
Fix 5.
Reset OneDrive
If none of the above works, tryresetting OneDriveto fix the upload issues.
PressWin + Rto evoke theRunbox.
Input%localappdata%\Microsoft\OneDrive\onedrive.exe /resetand pressEnter.
Upon the reset of OneDrive, fire up theRundialog again, jot down%localappdata%\Microsoft\OneDrive\onedrive.exeand click onOK.
This step is about to reconfigure OneDrive.
Fix 6.
Lets show you how it works.
MiniTool ShadowMaker TrialClick to Download100%Clean & Safe
Step 1.
Launch MiniTool ShadowMaker and clickKeep Trial.
Go toSync> selectSOURCEto choose the files you oughta sync > switch toDESTINATIONto choose storage > click onSync Now.
Related article:What Is Auto Sync Software?