How to Fix SharePoint PDF Error: Filename, Directory Name, or Volume Label Syntax Is Incorrect
Question details
Users are unable to open PDF files from SharePoint Online due to a syntax error message.
- Product
- SharePoint Online / Adobe Document Cloud
- Device & OS
- not provided
- Scenario
- Opening a PDF document directly from SharePoint Online through a cloud integration like Adobe Document Cloud.
- Observed behavior
- The system displays a 'Filename, Directory Name, or Volume Label Syntax Is Incorrect' error message, and the PDF document fails to open in the browser or viewer.
Verify that your internet connection is stable and that you have the appropriate access permissions to view files within the designated SharePoint folder.
Remove Unsupported Characters from File and Folder Names
Ensure that the SharePoint file name and its folder path do not contain special characters that disrupt the document cloud integration.
Cloud integrations often struggle to parse file paths that contain restricted symbols. Removing these characters usually resolves syntax errors immediately.
Navigate to the SharePoint document library where the problematic PDF is stored.
Review the name of the PDF and the folders it resides in for special characters such as #, %, *, <, >, ?, /, \, or |.
Right-click the file or folder, select 'Rename', and remove any unsupported characters, replacing them with standard dashes or underscores.
Click on the newly renamed PDF file to see if it now successfully opens in the integrated viewer.
Isolate the Issue to a Specific File or Folder
Determine whether the error is caused by a single corrupt file or if the entire SharePoint PDF integration is malfunctioning.
Capture Error Details for Support
If all PDFs fail to open despite having valid names, gather diagnostic information to submit to the software support team.
Open and Edit PDFs Seamlessly with WPS Office
If cloud integration syntax errors are preventing you from viewing SharePoint PDFs in your browser, downloading the file and opening it locally with WPS Office is a fast, foolproof workaround. WPS Office provides a highly compatible, lightweight PDF reader that bypasses network integration glitches.
- 1. Download the PDF from SharePoint: Select the problematic PDF in your SharePoint library, click the three dots (More options), and choose 'Download' to save it to your local drive.
- 2. Install WPS Office: Download and install WPS Office for free on your computer.
- 3. Open the file locally: Launch WPS Office, click 'Open', and select the downloaded PDF file from your local storage.
- 4. View and edit without errors: Read, annotate, or edit your PDF document smoothly without encountering any directory syntax errors.
Frequently Asked Questions
What characters are invalid in SharePoint file names?
Characters such as ~, ", #, %, &, *, :, <, >, ?, /, \, {, |, and } are often restricted or can cause syntax parsing issues when integrated apps try to read the file path.
Why does this error only happen with PDFs and not Word documents?
This specific error is usually triggered by third-party PDF cloud integrations communicating with SharePoint. Native Microsoft formats like Word and Excel use built-in Microsoft protocols that are less susceptible to these specific parsing errors.
How can I quickly view my PDF if the SharePoint integration remains broken?
The fastest workaround is to bypass the browser viewer entirely. Download the PDF file directly to your local computer and open it using a desktop PDF reader like WPS Office.
