There are at least two possible reasons why the HTML editor provider cannot see your image folder and it's contents:

1. If you created the images folder and/or uploaded files to it outside of the DotNetNuke file manager and did not use of the core FileUpload or URL control to perform the upload or use the core FileSystemUtils API to register the newly created folder and files, the DNN Folders and Files tables in the database do not contain the needed entries. You will need to either use the Recursive Sync command in the Admin --> File Manager to create the proper table entries or change your folder addition and file upload code to make use of DotNetNuke controls and folder/file system API's.

2. The folder and files have been properly registered in the DNN Folders and Files tables but the role(s) to which the users editing content with the HTML editor provider have not been granted the necessary Browse Folder and/or Open Files In Folder permissions. This can be done in the Admin --> File Manager for the newly created folder or programatically if your module will be creating additional folders on a regular basis.

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner