If you have added a File to your ePoster/Stack using the File Tile and you want to replace that file with an updated version then this is possible.
Return to your ePoster and open it for editing and then follow these steps:
Click on the edit icon in the top right of the File Tile you want to edit ​ Look in the settings area ​Click on the edit icon next to your uploaded filename
​You will then be able to upload your new file. Once it has uploaded and processed then you should save your stack/ePoster.