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Import / export is on the Inventory tab. Export copies your items out as CSV; import turns a CSV into items.
Import creates items. It never updates them. There is no id column, so nothing can match a row to an item you already have. Re-importing an export gives you two of everything.

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Columns

Six columns. Two are required; leaving out any of the rest means “use the default”. Column order does not matter, and capitals, spaces, underscores and hyphens are ignored, so Item Name, item_name and ITEM-NAME are one column. A heading nothing matches is reported, never silently dropped. The preview names it before anything is created.

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Condition

Either the short key or the label works. Capitals do not matter, and a space, a hyphen or a dot between two parts are all read the same way. Whether there is a separator at all does matter: Like New and LikeNew are two different conditions. Your subreddit sets the list. The import panel’s What values are accepted? shows this subreddit’s own keys, which is also what an export writes.

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Price

Currency symbols and thousands separators are stripped. A cell holding 1,200.00 with a currency symbol in front of it is read as 1200. A comma is only a thousands separator when exactly three digits follow it, so a decimal comma is never silently rescaled. 12,50 is refused rather than read as 1250. Where your subreddit has asking prices switched off the column is still read and still stored. Leave it in your file. The values come back if prices are switched on again.

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Photos

https://i.redd.it and https://preview.redd.it links only, separated by a pipe. Links from anywhere else are refused. Add photos through the app rather than by hand.

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Export

Export copies to the clipboard. It does not download a file. A Reddit app cannot hand you one. Copy CSV does it, and a text box underneath holds the same thing to select by hand.
Items come out oldest first.

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Import

1

Paste or pick a file

Paste a spreadsheet into the box, or choose a file. Copy a blank template gives you the header row on its own.
2

Check this file

Commas and tabs are both read, so a straight paste out of Sheets or Excel needs no converting.
3

Read the preview

It names every unrecognised heading and every row that will be refused, with the line each problem is on. Up to 20 are listed, then the rest are a count.
4

Import

The button carries the number that will actually be created. Nothing is created until you press it, and refused rows are never sent.
A run that fails part way through keeps what it already created and reports the rest as unsent.

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What does not survive a round trip

Three sets of rows come out of an export and are refused on the way back in. The export panel counts each before you copy.

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When a row is refused

The report hands back every row that did not become an item, in the same six columns, so a retry is a paste rather than an editing job. The commonest cause is a comma inside a description. Wrap the whole value in double quotes, or the row arrives with more values than there are columns. Where a run stopped because a request never came back, the report says the first batch of unsent rows may exist after all. Check before pasting those back.

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Limits

200 rows, 1 MB. A file over either is refused whole, before any of it is read. Your item cap still applies. The preview works out how many rows fit under your subreddit’s cap and puts the number on the button. See Inventory.