you could use a computer and log into iCloud and copy them to the iXpand drive. Not sure why the app is having trouble connecting with iCloud but you could try
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make sure you have a valid Internet connection. Wifi connected preferably but if it is failing on wifi try LTE.
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check the iCloud settings and make sure you are signed in and see if there may be some permissions issue.
You can also open a support ticket with sandisk support and submit the app logs. You would need to turn on iCloud photo sharing and then try to transfer all the files. Once you see the failures and after the transfer attempt has finished in the iXpand drive app select view files. pull down on the file list and in the search bar type “sandisklogs” and then tap search. This will open your default email client with the logs attached. You can email those to sandisk support and they can review them and see if they can find the root cause the app can’t connect with your iCloud account.
