I found the critical issue! Looking at both console logs:

Owner's logs: [v0] hasAccess check after grant: false (should be true) - The smart contract's hasAccess() returns false even after granting access. This means the contract is NOT storing the access properly.

Requester's logs: Show continuous "Auto-refreshing to check for new access grants" every 3 seconds and fetchUploadedFiles - File 2 hasAccess: false - The contract never returns true for hasAccess.

The smart contract has a bug in the grantAccess() function. It's not actually setting the accessList mapping. The transaction succeeds but the access isn't being stored.

First, let me remove the annoying 3-second auto-refresh and then we'll need to recompile the contract:

Now I need to fix the smart contract. The issue is that grantAccess() is not actually setting the access. Let me check the contract more carefully and recompile it with fixes:

The contract looks correct. The problem might be that the if (!accessList[_fileId][_user]) condition is preventing execution, or there's something else. Let me simplify the grantAccess function to ALWAYS set the access, regardless of previous state:

Now do the same for grantAccessWithExpiry:

I've updated the smart contract to ALWAYS set accessList[_fileId][_user] = true immediately, without the conditional check. This ensures the access is stored in the contract's mapping. Now you need to:

1. Recompile the updated contract in Remix
2. Deploy the new version to Sepolia
3. Share the new contract address and ABI
4. I'll update the app with the new contract address

I've also removed the annoying 3-second auto-refresh from the shared files page - it will now only refresh when the page gains focus or visibility changes.

I saved the changes from the code editor.