As you know, Microsoft’s consumer cloud storage platform is none other than OneDrive. It is where users can save any of their files albeit it’s mostly used to store common files like documents and photos. However, there are times when you might encounter some problems when saving these files. Recently, some users reported that they had problems saving Word documents to OneDrive and if you experience the same issue, then you’ve come to the right place as this post will guide you on how to resolve it.
According to users who encountered the problem, when they try to save Word documents on OneDrive, an error message appears instead stating, “This is not a valid file name”. This kind of error only occurs when the file is opened from within OneDrive for saving in a different folder. In other words, if the file is saved in the same folder, the error won’t pop up but if it is saved in a separate folder, that’s when the error appears. Worry not though for fixing this error is not complicated and won’t take too long.
It seems that this error is due to the 259-character limitation when creating and saving files as far as the Office products are concerned. To resolve it, there are several workarounds you can check out. Before you proceed with these workarounds, make sure that you have a stable internet connection.
The first thing you can do to fix the problem is to rename the file with a shorter name. Just right-click on the file and select the Rename option from the menu and then type in the new name and click OK or tap Enter to rename the file.
Like what you did in the first given option, all it takes is a right-click but this time on a folder. Rename the folder with a different name and save the changes made and then check if you can now save the Word document on OneDrive.
If the first two options didn’t work, you can try moving the file to a folder with a shorter path. Note that it is not the same as doing it locally on a Windows 10 computer so you have to right-click on the file and select the “Move to” option. After that, locate the folder where you want to move the file and select it and then click on the Move button to complete the task.
You could also try to make some modifications to the document. Once you’ve done that, click the File tab and select the Save As option and then go to the folder where you want to save the file and tap enter.
On the settings screen, choose Apps.
When the Apps screen opens on the left click on Default apps.
On right, you will get a list of Windows default applications for certain types of files. Click on any application you would like to change and choose from the drop-down list a new one. Click on it and you are done. 
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