ERROR: 0X80070780 File cannot be opened by the system

Hi danens1863,

I agree with you, that many new "features" of Dropbox look like bugs. According your description, seems you are disturbing by a bug with name "Smart Sync". Very poorly implemented and as a result such issues come up. If you can, turn this feature (bug) off. If you need to save disk space, considered "Selective Sync". As a last resort (you can't live without "Smart Sync") make sure the files you are working on are set 'local' in advance. 🤷 That's all you can do with Dropbox right now.

Good luck.

The problem is related to credentials.  Dropbox app in Windows uses onedrive to create a virtual drive.  You want to be sure that you are logged into onedrive with credentials that grant you access to the windows local drives or Adobe apps you expect to use. 

Best to uninstall and reinstall the dropbox app, and it should reset credentials.   Worked for me.

I can see this error as well. It has corrupted all my photos which is causing now a very painful process. Thank god I have a cold back up - I dont think I will use Dropbox for photo any longer. Its just very poor management and user experience.

I also have not been able to fix it and I dont want to involve Microsoft windows or any other software, I bought drobox because I want to use that one application - not be forced to use others.

Nancy Thanks for your response. It seems to be a problem when I view photos on my PC (Dell Laptop running windows 10 and link to dropbox. When I go into dropbox directly thankfully all photos are there.

and

any advice or assistance would really be appreciated. Not sure what triggered this corruption, It could have been a recent windows upgrade, as they used to work for many years very nicely.

Hi

Yes but I have to individually click each picture and ask for local. Not sure why this changed but its quite painful. It is a real issue in the file manager - I can see them all if I go into drobox directly.

I'm getting this error.  I'm trying to move an 'online-only' file to a different folder via cut/paste and it isn't working on my laptop.  When I'm at home on my top tier PC I don't have issues, but on this laptop I'm getting errors.  -- Obviously I can download and move the file.  But I don't want to do that on my limited bandwidth when I'm not home.  

Why can I not move files that are 'online-only'?  Is there a setting I'm missing?  All it should be doing is updating metadata on files and tell dropbox to move then.  I can normally do this, but on this PC I can't.

I also want to delete a file, but it won't let me.

I've recently had the same issue and fully agree with Здравко.

To make sure that I can open an online only file I have to first set it to be "Make Available Offline". The type of files affected were JPG's and Zip's - compressed data.