FileUpload Templated: Inconsistency in getFiles() and totalSize calculation during onSelect and onRemove events

Describe the bug

When utilizing the FileUpload component with custom templates (headerTemplate, itemTemplate), managing the total file size state (totalSize) externally becomes inconsistent. The onSelect and onRemove events appear to fire asynchronously relative to the component's internal file list update.

Reproducer

No response

System Information

"react": "18.3.1",
"react-dom": "18.3.1",
"primereact": "^10.9.7",

Steps to reproduce the behavior

Steps to Reproduce:
Create a FileUpload component using the App Router in Next.js (client-side) with headerTemplate to display an external totalSize state managed by useState.
Implement onSelect and onRemove handlers that attempt to use fileUploadRef.current.getFiles() to accurately calculate the current total size.
Select a single file (File A). The displayed total size is incorrect (often 0 or delayed).
Select a second file (File B). The total size calculation often incorrectly duplicates the size of File A plus the size of File B (e.g., A + A + B), or only shows the size of File A.
Deleting File B sometimes synchronizes the size correctly, sometimes no

Expected behavior

fileUploadRef.current.getFiles() should reliably and synchronously reflect the updated list of files immediately after the onSelect or onRemove events have fired, allowing external state management to remain synchronized without requiring workarounds.

Current Workaround:
The only reliable way to achieve synchronization is by using setTimeout(syncTotalSize, 0) within the onSelect and onRemove handlers to defer the state update to the next event loop tick.

Start with the FileUpload component's onSelect and onRemove event flow and the getFiles() behavior when using headerTemplate or itemTemplate. Reproduce the issue with React 18.3.1 and PrimeReact 10.9.7, then verify that getFiles() reflects the updated file list synchronously and that totalSize calculations no longer require setTimeout.