Why have the employee photos stopped loading?
BambooHR signs its photo links and those signatures expire after a while, so a link that worked when imported eventually stops. That is a property of how BambooHR serves images rather than anything going wrong here, and the import says so in its warnings. Importing again leaves a filled photo link alone, because BambooHR re-signs it on every read and replacing it would mark every employee as changed on every run; clear the cell and the next import fills a fresh one. If photos matter for good, copy them into an Attachment field on the directory.
Does it write anything back to BambooHR?
No. The connection reads the directory and nothing else, so BambooHR remains the HR record and nothing you do here can change an employee's details. That is the right way round: HR data has approval processes, audit requirements and legal obligations attached to it, none of which belong to a second system that happened to import a copy.
How do I handle leavers?
Mark them on the directory in RowFold, with a status or a leaving date in a column of your own, which the import never touches. Importing again updates the directory your other tables link to and adds new starters, but a leaver drops out of BambooHR's directory, so their record simply stops being updated here rather than disappearing. Once leavers are marked, anything still linked to them becomes findable: the laptop nobody collected, the certification nobody reassigned, the shifts still on the rota.
Is an employee directory safe to import?
It is more sensitive than most things you will import, and worth treating that way. Per-table and per-field permissions mean the tables that hang off it can be widely readable while the directory itself is not, and it is worth deciding that before anybody else sees the workspace rather than afterwards. Import only what you actually need to link against.
Can it import time off or compensation?
The directory is what comes across. That covers the case this exists for, which is giving your own operational tables real people to point at. Compensation in particular is not something to copy casually into a second system, since it multiplies the number of places a confidential figure lives without improving anything about how it is managed.