Welcome to Community! QuickBooks Online has the features you need to complete your daily tasks with peace of mind. It's important that you're able to upload the documents so you can get back to what you love. I'll be happy to assist!
Based on the information you've provided, I recommend clearing cache on your browser and then log into your QuickBooks account using a private or incognito browser. I also suggest trying other browsers such as Edge, Google Chrome, Safari or Firefox.
Once you've sent a request for your client to share a file, you can download it following these steps;
1. Open Clients from the left menu
2. Select the Client name
3. Click on the Shared documents tab
4. find the file in the Documents list
5. In the Action column, select Vertical ellipsis and then Download
Here's a helpful guide for your reference.
Should you require additional assistance, please don't hesitate to contact us.
Schedule a Callback or start a Chat: click (?) Help in the upper right in QuickBooks Online > enter "Contact support" > hit Contact Us > provide a brief summary of your situation > hit Let's Talk > choose Get a callback or Start a Chat.
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If you have other questions, feel free to reach back out. We'd be glad to help!