Are there any sourcing portals that keep document workflows and activity logs for each bid update?

Yes. Many e-sourcing / procurement platforms keep both:

• document workflows for each bid update or amendment, and
• activity/audit logs showing who changed what and when.

Common examples include:

• SAP Ariba Sourcing – keeps detailed audit trails and version history for events, RFx documents, and bid submissions.
• Coupa Sourcing – supports event activity logs, document revisions, and supplier communication history.
• JAGGAER – has workflow history, change logs, and document management for sourcing events.
• Ivalua – offers audit trails and full bid/event versioning.
• Oracle Fusion Cloud Procurement / Sourcing – tracks sourcing event changes and supplier actions.
• Proactis – typically includes activity logging and document/version control in sourcing workflows.
• RFP / bid management tools like RFPIO (Responsive), Loopio, or Qvidian may also keep version history and collaboration logs, though they’re more proposal/RFP-focused than full sourcing portals.

What to look for if this is a requirement:

• version control on RFQs/RFPs and attachments
• timestamped audit trail
• bid amendment history
• supplier response history
• role-based approvals / workflow states
• exportable logs for compliance

If you want, I can also give you a shortlist by industry, company size, or budget, or help you compare these against a specific sourcing process.