how to use publish-over-dropbox plugin

[jesus fernandez]

I am using Jenkins 2.299, I am trying to use the publish-over-dropbox(latest version) plugin for jenkins for the first time, but when I try to create the credentials using the kind Dropbox api token, I generate it and copy paste it to the token field, but then I get an ```A problem occurred while processing the request.

Logging ID=a615b9e8-c399-44d3-866a-5e7a71cb9a3e``` error and I get logout. Then I get a neverending callstack, this is the few first lines

```

2021-06-29 19:16:57.599+0000 [id=15]    WARNING hudson.security.csrf.CrumbFilter#doFilter: Found invalid crumb 2125f052b3c77f4a957e7b456a7ca37ca80fdd36dcc7a1988fb238cf721f6fb4. If you are calling this URL with a script, please use the API Token instead. More information: https://www.jenkins.io/redirect/crumb-cannot-be-used-for-script

2021-06-29 19:16:57.599+0000 [id=15]    WARNING hudson.security.csrf.CrumbFilter#doFilter: No valid crumb was included in request for /credentials/store/system/domain/_/createCredentials by jesus. Returning 403.

2021-06-29 19:17:06.152+0000 [id=75]    WARNING o.e.j.s.h.ContextHandler$Context#log: Error while serving http://localhost:8080/credentials/store/system/domain/_/createCredentials

java.io.IOException: HTTP 400 error Bad Request

Caused: java.io.IOException: {"error_description": "code doesn't exist or has expired", "error": "invalid_grant"}

        at org.jenkinsci.plugins.publishoverdropbox.domain.JsonObjectRequest.execute(JsonObjectRequest.java:181)

        at org.jenkinsci.plugins.publishoverdropbox.domain.DropboxV2.readAccessTokenFromWeb(DropboxV2.java:576)

Caused: org.jenkinsci.plugins.publishoverdropbox.domain.model.RestException: Error when retrieving access token from Dropbox

        at org.jenkinsci.plugins.publishoverdropbox.domain.DropboxV2.readAccessTokenFromWeb(DropboxV2.java:578)

        at org.jenkinsci.plugins.publishoverdropbox.domain.DropboxV2.convertAuthorizationToAccessCode(DropboxV2.java:544)

        at org.jenkinsci.plugins.publishoverdropbox.impl.DropboxTokenImpl.<init>(DropboxTokenImpl.java:53)

Caused: java.io.IOException: Error when retrieving access token from Dropbox

        at org.jenkinsci.plugins.publishoverdropbox.impl.DropboxTokenImpl.<init>(DropboxTokenImpl.java:55)

        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

        at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)

        at java.lang.reflect.Constructor.newInstance(Unknown Source)

        at org.kohsuke.stapler.RequestImpl.invokeConstructor(RequestImpl.java:541)

Caused: java.lang.IllegalArgumentException

        at org.kohsuke.stapler.RequestImpl.invokeConstructor(RequestImpl.java:556)

        at org.kohsuke.stapler.RequestImpl.instantiate(RequestImpl.java:805)

        at org.kohsuke.stapler.RequestImpl.access$200(RequestImpl.java:85)

        at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:690)

```

I have no idea what is causing this, if the plugin is not working or I am doing something wrong