LR mobile iPad won’t export to Dropbox

Question

Hello, 
Im using the most recent version of LR (5.3.1) and when I choose to "share" my images the option for Dropbox is greyed out & not selectable. I can get to Dropbox with three different "share" workflows: 
"Share To" "Export to Files" or "Export As..." 
All three options yield the same result. This seems like a Dropbox issue not LR but I wanted to know if anyone else has experienced this. I'm using an iPad Pro, and my Dropbox is also updated. This has not always been a problem so it's hard for be to believe it's user error but I'm here for ideas!
{Moved from Lightroom Cloud to Lightroom Mobile Forum by Moderator}

selondon · Accepted Answer

Just been playing around with this... if you go into the Files App / Dropbox in your iPad first, it must do something like authenticate.

Returning to Lr or Apple Photos after this and then exporting shows me Dropbox and the export is successful

selondon · Answer

Accessed the iOS Files App above - then accessed Dropbox from there. Afterwards I went into LrM again and exported without issue.

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