Evidence Upload
Evidence documents provide the audit trail that backs up your emissions data and target claims. They can be attached to emission entries, milestone records and certificate requests.
Where you can attach evidence
| Object | Where |
|---|---|
| Emission entry | Entry detail → Attachments tab |
| Target milestone | Milestone row → Verify Milestone |
| Certificate request | Certificate form → Supporting documents |
| Offset retirement | Retirement record → Attachments |
Uploading a document
- Navigate to the relevant record
- Click the Attachments tab (or the + Add Document button)
- Drag files onto the upload area or click Browse
- Add a label to each file (e.g., "August electricity invoice", "Q3 audit report")
- Click Upload
Supported file types and limits
| Type | Extensions | Max size per file |
|---|---|---|
| Documents | PDF, DOCX, XLSX, CSV | 25 MB |
| Images | PNG, JPG, JPEG | 10 MB |
| Archives | ZIP | 50 MB |
Up to 10 files can be attached per record.
Version control
If you upload a file with the same name as an existing attachment, AlchemOS Positive prompts you to:
- Replace — creates a new version; the old version is retained in history
- Add as new — keeps both files with automatic name disambiguation
View version history by clicking the clock icon next to any attachment.
Document types and labels
Use clear, consistent labels to make audit retrieval straightforward:
| Common label | Use |
|---|---|
Electricity invoice {MMM YYYY} |
Utility invoice supporting an electricity entry |
Energy data extract {YYYY} |
Bulk-meter data from building management system |
Verification report {YYYY} |
Third-party GHG verification report |
Audit confirmation |
External auditor sign-off letter |
Registry retirement certificate |
PDF from Verra/Gold Standard confirming retirement |
Board resolution |
Resolution confirming target commitment |
Access control
| Role | Can upload | Can view | Can delete |
|---|---|---|---|
| Admin | ✅ | ✅ | ✅ |
| Manager | ✅ | ✅ | Own uploads |
| Data Entry | ✅ | Own and linked | Own uploads |
| Read Only | ❌ | ✅ | ❌ |
| Auditor (external) | ❌ | ✅ (linked records only) | ❌ |
Bulk download for audit
From any record's Attachments tab, click Download All to get a ZIP archive of every attachment on that record.
For a full audit pack across multiple records:
- Go to Settings → Audit Pack
- Select the period and record types to include
- Click Generate Audit Pack — produces a dated ZIP with all evidence files organised by category
Storage and retention
Evidence files are stored in encrypted object storage (AES-256). Files are retained for 10 years by default to satisfy long-term audit requirements. Retention can be extended to 25 years on the Enterprise plan.