Uploading files when internet connection is restored

[Mr_Ragweed2]

Hello and thanks for reading this. I have some spreadsheets utilized by service technicians that upload to SharePoint via a button i put on the sheet. It works fine. My issue is that sometimes the technicians are in an area where they have no internet connection and then i get an error based on that. I assuming the simpler solution is to just save all of the files to a workbook on their hand-held device and then when they get to the office they could "sync" to SharePoint. I could have each file be a new worksheet in the same workbook and then when they "sync", write code that saves each worksheet as a file to sharepoint. I can do that part (or at least i used to be able to haha.) There will be a dynamic number of files that need saved each day.
My question is this - Is the code simply going to be activated by the following?

Sub Refresh()
ActiveWorkbook.RefreshAll
End Sub

Or is there an entirely better approach to this issue?
Thanks for your patience in reading this. Any guidance from this forum has always proved to be helpful.

 

[Mr_Ragweed2]

I'm not really expecting for someone to try and provide a code solution for this. I'm open to just receiving comments/brainstorm ideas.

Thanks,