Skip to main content

Why are some files missing after downloading from Procore Sync?

The Procore Sync application will be discontinued on September 30, 2022, after which you will no longer be able to use this application. We will continue to support the application until that date. For additional information, please refer to Procore Sync: End of Support for the Procore Sync Application or reach out to your Procore point of contact for more information.


You are downloading folders to your Windows computer from Procore Sync, and you notice that after downloading, some files or folders are missing.


There are several reasons why files might be missing from Procore Sync. Possible reasons are that the folder or file name:

  • Ends with a period or whitespace.
    • Windows OS does not allow folders with names ending in a period or whitespace to be downloaded and stored on the computer. This is an operating system limitation and Procore has no control over it. A common example of a folder in the Documents tool that cannot be synced is the name of a sub contractor such as “Smith’s Mechanical Inc.”
  • Has more than 260 characters.
  • Contains forbidden characters.
    • < (less than)
    • > (greater than)
    • : (colon)
    • ” (double quote)
    • / (forward slash)
    • \ (backslash)
    • | (vertical bar or pipe)
    • ? (question mark)
    • * (asterisk)
    • “Tab” character
    • Certain special characters with integer value zero, (i.e., ASCII NUL character), or characters whose integer representations are in the range from 1 through 31.
  • Contains Windows reserved device names. 
    • CON, PRN, AUX, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, and LPT9.
      Note: Also avoid using these in names followed immediately by a file name extension. For example, NUL.txt is not recommended.
  • Contains filenames that are not accepted.
    • thumbs.db
    • desktop.ini
    • .ds_store


This problem can be resolved by renaming the file or folder to remove any characters mentioned above. This can be done through the Documents tool in Procore's web application, or through Procore Drive. See the following tutorials on renaming files and folders:

For additional information regarding characters in filenames, see Microsoft's support page: Naming Files, Paths, and Namespaces.

See Also