Only first files included in batch
The member clicked upload with more files queued than their plan allows in one batch. Only the first {maxBatch} files are included; the rest wait for another run.
Why this happens
Same Max items per upload ceiling as the partial-add warning (ul2_max_batch_*). Here the queue was already over the limit when Upload ran, so the client truncates before sending.
Diagnose and fix
1. Member: let the first batch finish, then upload the remaining files (or remove extras before starting).
2. Admin: raise Users & limits → Max items per upload for that tier if the business allows larger batches.
3. Per-user override when needed.
4. If they also hit parallel limits, check File upload slots separately.